In the following question, out of the four alternatives, select the alternative which best expresses the meaning of the idiom/phrase. What time shall we go shopping Rohit?” “Let’s see how the weather looks and play it by ear. 

In the following question, out of the four alternatives, select the alternative which best expresses the meaning of the idiom/phrase. What time shall we go shopping Rohit?” “Let’s see how the weather looks and play it by ear.  Correct Answer Decide further plans as you go along

The idiom play it by ear means 'rather than sticking to a defined plan, you will see how things go and decide on a course of action as you go along.'

Sentence: If we go into the meeting unprepared, we'll have to play everything by ear.