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:

The secretary and the treasurer are hand in glove with each other.

A very good friends

B constantly fighting

C associates in some action

D suspicious of each other

ANS:A - very good friends

No answer description is available.