A Super Toy

What is going to happen to the small rubber ball after both balls have bounced off of the ground? Support your answer with arguments!

a) The small rubber ball bounces up more than twice the height of its original height. That is because the bigger ball transfers its energy onto the smaller one.

b) The small rubber ball bounces up more than twice the height of its original height. The more elastic a ball, the more energy can be released.

c) The small rubber ball reaches exactly the original height, because the total amount of energy is preserved.

d) The small rubber ball doesn't reach the original height. During the collision a lot of energy is transformed into warmth and so the ball loses its energy for the movement.