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:

You have to be a cool customer and be patient if you want to get the best buys.

A Be calm and not be excitable

B Have a cool head

C Be uncommunicative

D Be choosy

ANS:A - Be calm and not be excitable

No answer description is available.