A golf ball traveling 3 m/s to the right has a head-on collision with a stationary bowling ball in a friction-free environment. If the collision is almost perfectly elastic, the speed of the golf ball immediately after the collision is:
A. Slightly less than 3m/s.
B. Much less than 3 m/s.
C. Equal to 3 m/s.
D. Slightly greater than 3m/s.