An Action Potential Begins When,in Response to a Stimulus,_______

An action potential begins when,in response to a stimulus,_______.

A) sodium channels open and sodium enters the neuron
B) sodium channels open and sodium exits the neuron
C) potassium channels open and potassium enters the neuron
D) potassium channels open and potassium exits the neuron
E) sodium channels close and sodium is pumped out of the neuron