Triggering of the Muscle Action Potential Occurs After

Triggering of the muscle action potential occurs after

A) acetylcholine binds to chemically gated channels in the motor end plate membrane.
B) acetylcholinesterase binds to receptors on the end plate.
C) calcium ion binds to channels on the end plate.
D) the nerve action potential jumps across the neuromuscular junction.
E) Any of the above can produce an action potential in the muscle cell.