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Expression of Ideas questions test sentence clarity. Option C eliminates redundancy while keeping the nonessential phrase clear. Option A is acceptable but slightly changes emphasis. Option B adds wordiness. Option D is ungrammatical. Concision plus accuracy makes C the best choice.

“Turning point” describes a decisive moment where circumstances shift. Option A is correct. The other options contradict the figurative meaning.

The subject is “group,” a singular collective noun, so the verb must be “was.” Option B corrects the error. Option A incorrectly uses plural. On the PSAT, eliminate prepositional phrases to focus on the true subject.

45% × 400 = 0.45×400=1800.45 \times 400 = 180. Option C correct. Always check by multiplying fraction: 45/100 × 400 = 180.

The subject is “pack,” singular. Correct verb: “is.” Prepositional phrase (“of wolves”) doesn’t change subject-verb agreement.