(Multiple Choice) Two identical billard balls are rolling toward each other at the same speed. What will be true after they collide head-on?

A. They will both stop rolling immediately after the collision.
B. One ball will stop rolling as the other bounces backward at a slower speed.
C. They will both bounce back at a faster speed after the collision.
D. They will both bounce back at the same speed they had before the collision.

I'm stuck between options A and D. Please explain your answer so I can understand this better! Thank you in advance!