The Stability of a Bicycle Is Due to Angular Momentum

Multiple Choice

The stability of a bicycle is due to angular momentum of the wheels when the bicycle is moving forward. The stability is due to the net angular momentum vector, which

A) points upward, perpendicular to the surface of Earth, thereby canceling the weight of the bicycle and rider.
B) points to the rider's left.
C) increases when the bicycle slows down due to conservation of energy.
D) is actually zero, since the back wheel cancels the angular momentum of the front wheel.