In the following question, four alternatives are given for the idiom/phrase in bold and italics in the sentence. Choose the alternative which best expresses the meaning of idiom/phrase.
The detective left no stone unturned to trace the culprit.
A.
took no pains
B.
did very irrelevant things
C.
resorted to illegitimate practices
D.
used all available means
Correct answer is D
No explanation has been provided for this answer.
