The correct option is B 22
The clock hands make 0° angle with each other once in each hour. However, between 11 O' clock and 1 O' clock, they make 0° angle just once, that is, at 12 O' clock.
So, in 12 hours, the clock hands will make 0° angle with each other 11 times.
Therefore, the number of times in a day they will make 0° angle
= 11 × 2