How would a chemical that prevents the opening of voltage-regulated Na+ channels affect the function ofa neuron?

A) The neuron will only be able to hyperpolarize.
B) The neuron will depolarize more rapidly.
C) Action potentials will lack a repolarization phase.
D) The neuron will automatically and repeatedly produce graded potentials.
E) The neuron will only be capable of producing graded potentials.