A patient is hospitalized with muscle spasms caused by failure of back muscles to relax after contraction. Which of the following would be most likely to help?

A) Depolarize the motor neurons to send an action potential to the muscle cells.
B) Increase the amount of acetylcholine at the synapses between motor neurons and muscle cells.
C) Induce tropomyosin and troponin to bind to the myosin binding sites on actin.
D) Inject calcium into the muscle cell because it is not being released from the sarcoplasmic reticulum.