53. A drug might act as a stimulant of the somatic nervous system if it
(A) increases the sensitivity of the postsynaptic membrane to acetylcholine.
(B) increases the release of substances that cause the hyperpolarization of the neurons.
(C) stimulates the activity of acetylcholinesterase in the synaptic cleft.
(D) makes the membrane permanently impermeable to sodium.
(E) increases the sensitivity of the presynaptic membrane to acetylcholine.