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Venal means open to bribery or motivated by corrupt financial gain. The political context—“officials” and a contested contract—signals concerns about integrity, not fairness or clarity. “Bribable” (B) captures that meaning precisely. “Merciful” (A) is unrelated to ethics of procurement. “Transparent” (C) and “Impartial” (D) are positive governance traits that directly oppose the insinuation in the stem. On Nelson–Denny items, map the connotation to the institutional domain; words like venal, “graft,” and “kickback” cluster around corruption. A substitution test—“encouraged bribable behavior”—retains the accusation’s sting. Do not confuse venal with “venial” (pardonable, as in minor sins); the latter softens fault, whereas venal intensifies it. Recognizing this distinction helps you interpret editorials and investigative passages where author stance hinges on whether a failure is corrupt (venal), minor (venial), or merely negligent. Exam strategy: eliminate options that change the moral axis (e.g., compassion or logistics) when the sentence clearly targets ethics.

“Diffident” describes a shy, self-effacing manner marked by low confidence or reserve. The cleanest opposite is “self-assured” (A), which conveys confident presence and poise. The distractors are near-synonyms of diffident: “timid” (B) and “hesitant” (D) reflect reluctance or fearfulness, while “wary” (C) denotes cautious distrust, which may manifest as reserve but is not the polarity flip the question seeks. On Nelson–Denny antonym items, place terms on a confidence continuum: diffident/timid/retiring ↔ confident/self-assured/assertive. Then test by substitution: a diffident presentation versus a self-assured presentation reverses audience perception exactly. Distinguish “diffident” from “modest” (which can be positive, balanced humility) and from “demure” (often gendered and decorum-focused). Precision matters because author attitude in profiles or analyses may hinge on whether a speaker is truly lacking confidence or simply measured. Recognizing the antonym quickly helps reserve time for longer reading passages.

“Pernicious” denotes harm that is especially insidious—spreading subtly or gradually until consequences are serious. In the sentence, rumor-mongering undermines health campaigns not through a single blow, but by eroding trust, depressing participation, or promoting misinformation over time. That aligns with (C). “Harmless” (A) and “Beneficial” (B) invert the warning. “Transient” (D) speaks to duration, not damage; pernicious harms can be long-lasting. On Nelson–Denny vocabulary tasks, align word choice with causal logic: if a behavior degrades outcomes indirectly (e.g., rumors → lower vaccination uptake → preventable outbreaks), the modifier should encode latent harm rather than immediate catastrophe. Substitution—“can have subtly harmful effects”—keeps the sense intact. Distinguish pernicious from “noxious” (harmful/poisonous) and “baneful” (causing ruin); all imply injury, but “pernicious” often emphasizes stealth and accumulation—an important nuance when interpreting policy and public-health prose.

The passage links tiered rates to three outcomes: (1) lower consumption (14% drop), (2) steadier finances (“revenue volatility eased”), and (3) equity protections (credits covering the baseline for low-income customers). It also notes some conservation persisting after rains, likely due to durable efficiency upgrades (“retrofitted fixtures”). Together, these details support A: the policy levered price signals to reduce discretionary use, safeguarded essential needs via a subsidized baseline, and smoothed budgets. B contradicts the credit provision. C ignores the evidence of continued (though smaller) conservation. D is the opposite of what planners observed. On Nelson–Denny inference items, integrate operational metrics with design features: tier thresholds and credits explain why conservation can rise without regressive impacts. The persistence of savings after the acute phase highlights habit and capital changes, a common theme in resource-policy passages that test your ability to separate short-term behavioral responses from longer-term structural shifts.

“Mendacious” means lying or untruthful. The sentence’s consequence—“reopened the inquiry”—signals that the statement wasn’t merely unclear; it was false in a way that affected decisions. “Deceptive” (B) captures intentional untruth or misleading content. “Candid” (A) is the opposite, denoting frank honesty. “Curious” (C) implies oddness, not falsity. “Gracious” (D) relates to courtesy, irrelevant to truth value. Nelson–Denny items often hinge on causal connectors: if mendacity prompts renewed investigation, the term must encode falsehood serious enough to undermine trust. Distinguish “mendacious” from near-neighbors like “specious” (plausible but false reasoning) and “erroneous” (incorrect without implying intent). In argumentative passages, spotting such evaluative labels is essential for tracking credibility: mendacious sources should be weighed differently than merely mistaken ones. Substituting “deceptive” preserves both meaning and tone, verifying the answer quickly and guarding against distractors that merely shift register without matching denotation.