In Which One of the Following Situations Will There Be

Multiple Choice

In which one of the following situations will there be an increase in kinetic energy?

A) A projectile approaches its maximum height.
B) A ball starts from rest and freely rolls downhill.
C) A box is pulled across a rough floor at constant speed.
D) A satellite travels in a circular orbit around the earth at fixed altitude.
E) A stone at the end of a string is whirled in a horizontal circle at constant speed.