Eyebrow Hairs Are Always Shorter Than Hairs on Your Head

Multiple Choice

Eyebrow hairs are always shorter than hairs on your head because________.

A) they grow much slower
B) hormones in the eyebrow follicle switch the growth off after it has reached a predetermined length
C) the vascular supply of the eyebrow follicle is one-tenth that of the head hair follicle
D) eyebrow follicles are only active for a few months