Which of the Following Statements Is Not True

Which of the following statements is not true?

A) Nervous stimulation of skeletal muscle is always excitatory, whereas nervous stimulation of smooth muscle may be excitatory or inhibitory
B) A single smooth-muscle cell may be innervated by both a sympathetic neuron and a parasympathetic neuron
C) The contractile activity of smooth-muscle cells may be affected by hormones
D) In the absence of neural input, skeletal muscle cannot generate tension
E) None of the choices are true