Select the most appropriate idiom ( in the context) to fill in the sentence.
In trying to solve the crime, the detective found himself ______ yet the mystery kept deepening.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. beating his brains out.
The meaning of the given idiom is-
beating his brains out - Make a great mental effort to understand.
The meaning of the idiom completely suits the contest of the statement so it will be correct.