JIPMAT 2023 (VA) PYQs

In this question, four options are given for the idiom underlined in the sentence.

For his alleged involvement in espionage, he is under a cloud these days.

Brevity is the soul __________ wit.

Pick out the part of sentence which has an error. If there is no error mark ‘4’.
A) It wasn't necessary for her
B) To take time of work
C) when her son was ill