What is meant by a “tonotopic map”?

a. Each location in the auditory cortex responds to a preferred tone, and these areas are arranged in order from low pitches to high pitches.

b. The auditory cortex has axons back and forth to every other part of the cortex and several nuclei of the thalamus.

c. Each neuron in the auditory cortex has a distinctive pattern of responding depending on the location of the source of sound in space.

d. Each cell in the auditory cortex has a “partner” cell in the visual cortex.