I believe its C because it seems the most reasonable.
Well if you're talking about the distance from one charged particle to another then the change from the particle stays the same unless there is polarization, but the electric field/charge stays the same
The correct answer is d. both excitation and inhibition.
There is a process which is called summation and it refers to the process that determines whether or not an action potential (on postsynaptic neuron) will be generated by the combined effects of excitatory and inhibitory signals (from the presynaptic neurons). Depending on the sum total of inputs, summation may or may not reach the threshold voltage to trigger an action potential (firing of postsynaptic potential).
