Question

that portion of the hair that extends above the surface of the skin is the:
a medulla
b shaft
c hair bulb
d cuticle
e root

Explanation:

The hair shaft is the visible part of the hair that extends above the skin's surface. The medulla is the innermost layer of the hair, the hair bulb is at the base of the hair follicle, the cuticle is the outer protective layer of the hair (but it's part of the shaft structure), and the root is the part embedded in the skin.

Answer:

B. shaft