Which of the Following Best Describes the Firing of a Neuron

Multiple Choice

Which of the following best describes the firing of a neuron (action potential) ?

A) a change in axonal membrane permeability facilitating an inflow of positive ions
B) an electrical current initiated in the cell body which flows the length of the axon
C) the opening of ion channels, promoting a negative charge within the axonal membrane
D) the transmission of neuronal impulses across the synaptic cleft