What is the function of the central nervous system?

what begins when a neuron is stimulated by another neuron or by a stimulus in the environment?
a. a threshold
b. a resting potential
c. an impulse
d. a dendrite

The answer is : C. an impulse
An impulse is what trigger your reaction towards an occurrence. For example , if your skin touch a hot substance that could damage it. The stimulus it received will create an impulse that make your body make a quick movement to take your skin away from the hot susbtance 

This is the weirdest question i’ve ever seen