In the following questions, four alternatives are given for the Idion/Phrase printed in bold in the sentence. Choose the alternative which best expresses the meaning of the idiom/Phrase.
My efforts at pest control went in vain, I have to go back to the drawing board.

Options

A. Plan it all over again
B. take professional help
C. spend some time researching abroad
D. work at night

Answer

A

Explanation

Back to the drawing board = to start thinking about a new way of doing something after a previous plan or ideal has failed.