The cytoplasmic extensions that, together with the cell body, provide the main receptive surfaces for neurons are:. a. dendrite.
b. axon.
c. cell body.
d. neuroglia.

Dendrite

Explanation:

Dendrite with cell body are cytoplasmic projections that are present at the begin of neurons and help increase the cell body surface area through their extensions. The cytoplasm of dendrites and that of cell body have the same number of neurons. Dendrite receive electrical impulses from neurons and send those information to the sons.

not sure if this what   you'r looking for would be percent composition