Choose the option that is the closest in meaning to the phrases in bold:
The phrase "I racked my brains" means I subjected my mind to hard thinking. It describes intense mental effort or strain to figure something out.
Option A: This implies research or study, not the mental struggle suggested by "racked my brains."
Option B: This involves seeking external help, while "racked my brains" focuses on personal effort.
Option C: This suggests a simpler, intuitive approach, not the intense thinking implied by the phrase.
Therefore, Option D is the correct answer.
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