When an Action Potential Is Generated Within a Motor Neuron

When an action potential is generated within a motor neuron,

A) all of the muscle cells within the motor unit are stimulated to relax.
B) the muscle cells of the motor unit will occasionally contract.
C) only select muscle cells within the motor unit are stimulated to contract.
D) every muscle cell of the motor unit is stimulated to contract.
E) the muscle cells from a neighboring motor unit will contract.