a initiating signal transduction pathways in the cells.
b altering the permeability of the cells.
c causing molecular changes in the cells.
d affecting ion-channel proteins.
e all of the above.
I'm kind of sure its A, since B is wrong since neurotransmitter only alters the permeability of presynaptic cells, C is also wrong, D is wrong since the ion-channel is not made of protein, but of ligand.
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