The correct option is D 15 minutes
The time displayed by clock is 09:45 A.M.
She has to attend music classes at 10 A.M.
It takes the minute hand 5 minutes to move from one number to the next.
For 10:00 AM, the minute hand has to reach 12.
12 - 9 = 3
So the she is left with = 3 x 15 = 15 minutes