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In solutions, the solute is the substance being dissolved; the solvent is the substance doing the dissolving. Here, salt (sodium chloride) dissolves in water, so salt is the solute and water is the solvent. Option B is correct. Option A would apply if water were identified. Option C (“reactant”) applies to chemical reactions but dissolving is a physical process. Option D is overly broad—salt is a compound, but in the context of a solution, it functions specifically as solute. GED Science often requires distinguishing terms in context. Memorize: solute = smaller amount, dissolves; solvent = larger amount, does the dissolving.

Osmosis is a special case of diffusion involving water moving through a semipermeable membrane toward the region with higher solute concentration (i.e., lower water potential). Option C captures all essential features: water, semipermeable membrane, and direction relative to solute concentration. Option A is generic diffusion (not specific to water or membranes). Option B describes active transport, which requires energy (ATP) to move substances against concentration gradients. Option D describes bulk flow (e.g., blood pressure in vessels), which is driven by pressure, not primarily by solute concentration differences across a selective membrane. On GED Science, pay attention to the substance (water vs. solute), the barrier (semipermeable), and whether energy is required (osmosis is passive). Visualizing a U-tube with a membrane and different solute concentrations can help: water rises on the high-solute side because it crosses to equalize water potential.

Markup = 20% of 50 = 0.20 × 50 = 10. Selling price = cost + markup = 50 + 10 = $60. Option C is correct. Option A uses 10% instead of 20%. Option B miscalculates percentage. Option D adds too much. GED Math requires careful handling of percent problems. Always identify base (cost price), compute percent, and add/subtract as required. Cross-check: 20% of 50 = 1/5 of 50 = 10, simple mental math. Correct reasoning ensures speed and accuracy.

Option B is a complete thought with subject (rain), verb (fell, caused), and full idea. Options A, C, and D are dependent clauses missing main clauses, making them fragments. On GED RLA, fragments often start with subordinating conjunctions (while, because, since, although) but lack an independent clause. Test by asking: does the sentence express a complete idea? If not, it’s a fragment.

Option A replaces the inflated phrase “Due to the fact that” with the concise “Because,” eliminates “going to implement a plan in the near future,” and states the action directly (“will add”). It preserves substance (cause → action) and improves flow. Option B is vaguer and keeps the non-specific “implement a plan soon.” Option C weakens certainty with “maybe,” undermining meaning; it also adds a semicolon that suggests a heavier logical break than needed. Option D repeats vague planning language without specifying the action; “in the near future” is filler. For GED RLA editing, prioritize: (1) replacing wordy phrases with direct conjunctions (because, although, since), (2) expressing actions with precise verbs (“will add” vs. “implement a plan”), and (3) removing hedges unless the source text needs caution. Read aloud to test rhythm and clarity; the best revision should be shorter without losing essential detail.