Idioms and Phrases - Verbal and Reasoning

In the following questions four alternatives are given for the idiom/phraseitalicised and underlinedin the sentence. Choose the alternative which best expresses the meaning of idiom/phrase.
Q1:

Harassed by repeated acts of injustice. he decided to put his foot down.

A not to yield

B resign

C to accept the proposal unconditionally

D withdraw

ANS:A - not to yield

No answer description is available.