Consider the Sensory Homunculus

Consider the sensory homunculus.Why is a large portion of the sensory area dedicated to the hands and fingers?

A) Sensory receptors are larger in the hands and fingers than in other parts of the body.
B) Sensory receptors are equally distributed in all body areas.
C) There are fewer sensory receptors in the hands and fingers than in other parts of the body.
D) There are a larger number of sensory receptors in the hands and fingers than in other parts of the body.