How many times do the hands of a clock coincide in a day? 

Correct option is B

The correct answer is (B) 22.

The hands of a clock coincide 11 times in every 12 hours. Since a full day consists of 24 hours, the total number of coincidences in a day is:

​$$11 \times 2 = 22$$​​

This happens because the hands overlap approximately every 65 minutes, not exactly every 60 minutes.