If she __________ more carefully, she would not have made that terrible blunder during the presentation.

Answer: C. had prepared

Correct Answer: C) had prepared• Explanation: This sentence uses a Type 3 (Third) Conditional structure, which deals with an unfulfilled condition in the past. The result clause uses "would not have made" (would + have + past participle), meaning the condition ("if" clause) must use the past perfect tense ("had prepared").

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