Your Brain Differentiates Between a Tap on Your Arm and a Sharp

Multiple Choice

Your brain differentiates between a tap on your arm and a sharp slap on your arm by the 

A) number of action potentials produced in response to the sensory input. 
B)  size of the action potentials produced in response to the sensory input.​ 
C)  kind of neurotransmitters released at the synapse of the sensory neuron.​ 
D)  number (2 or more different kinds) of neurotransmitters released at the synapse of the sensory neuron.​