A Patient Is Hospitalised with Muscle Spasms Caused by Failure

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

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