Each Nerve Impulse to a Muscle Fiber Is Able to Create

Each nerve impulse to a muscle fiber is able to create just one twitch of that fiber because

A) acetylcholine is a weak neurotransmitter only capable of generating one twitch at a time.
B) Acetylcholinesterase breaks down acetylcholine immediately after the contraction is signaled.
C) The sarcolemma is only able to release calcium once per millisecond.
D) The muscle fiber is easily fatigued, so it can only twitch once before needing an interval of rest.