Question:

I racked my brains to solve this difficult problem.

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Rack one's brains means to think very hard, not to read or ask others.
Updated On: Jul 14, 2026
  • I read a large number of books.
  • I consulted several people.
  • I used my commonsense.
  • I subjected my mind to hard thinking.
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The Correct Option is D

Solution and Explanation

Step 1: Understand the idiom.
The phrase "racked my brains" means to think hard and strain your mind to find a solution or recall something. It does not refer to reading, asking others, or trusting instinct. It points only to intense mental effort by the person alone.

Step 2: Check each option against this meaning.
Option A says the person read many books, but the idiom is about thinking, not reading. Option B says the person asked others for help, but racking your brains means solving it yourself, not consulting people. Option C says the person used commonsense, which is a much milder idea than the intense effort the idiom carries.

Step 3: Match the closest meaning.
Option D says the person subjected the mind to hard thinking. This matches the idiom exactly, since racking your brains is about pushing your mind to work hard on a problem.

Final Answer:
The idiom "rack one's brains" means to think very hard, so option D gives the correct restatement. \[ \boxed{\text{D}} \]
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