A Hot Spoon Placed on Your Tongue Will Cause Some

A hot spoon placed on your tongue will cause some cells to fire action potentials more frequently; other cells increase their firing rates when a cold spoon is placed on your tongue.This is because

A) thermoreceptors detect the heat and increase the rate of firing.
B) a pressure-sensitive channel increases its firing rate, due to the weight of the spoon.
C) sensory cells in your tongue identify the spoon as painful and slow down their firing rate.
D) different types of receptor cells have different responses to temperature changes.
E) the receptors that the spoon actually touches slow down their firing rate, while those the spoon does not touch increase their firing rate.