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)Inject Ca²⁺ into the muscle cell, because Ca²⁺ is not being released from the sarcoplasmic reticulum.
B)Induce tropomycin and troponin to bind to the myosin binding sites on actin.
C)Increase the amount of acetylcholine at the synapses between the motor neurons and muscle cells.
D)Depolarize the motor neurons to send an action potential to the muscle cells.
E)Remove ATP so that Ca²⁺ remains in the cytoplasm.