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.
You have to be a cool customer and be patient if you want to get the best buys.
Be calm and not be excitable
Have a cool head
Be uncommunicative
Be choosy
Correct answer is A
No explanation has been provided for this answer.