An Ice Skater Performs a Pirouette (A Fast Spin) by Pulling

Multiple Choice

An ice skater performs a pirouette (a fast spin) by pulling in his outstretched arms close to his body. What happens to his rotational kinetic energy about the axis of rotation?

A) It does not change.
B) It decreases.
C) It changes, but it is impossible to tell which way.
D) It increases.