Which of the Following Statements Best Describes the Propagation of Action

Multiple Choice

 Which of the following statements best describes the propagation of action potentials?

A) The action potential is reproduced repeatedly down the length of the axon.
B) One action potential is formed at the axon hillock, and this same signal travels down the length of the axon.
C) When the axon hillock reaches threshold, action potentials are simultaneously formed down the length of the axon.
D) One action potential is formed at the axon hillock, triggering the movement of chemical messengers that travel the length of the axon.