Considering the law of conservation of energy, we believe that a super-duper bouncy ball should keep bouncing - forever. Yet, we know that it eventually stops.

How is energy conserved or is it?

Bouncing Balls GIFs | Tenor

a. A. Some is converted into sound energy and escapes into the surroundings.
b. B. Some is converted into thermal energy and escapes into the surroundings.
c. C. Neither A. or B.
d. D, Both A. and B.