Final answer:
Lanugo hairs are fine, colorless hairs that cover a fetus's face and body until they are shed close to the time of birth. They exist primarily in fetuses and are often referred to as 'peach fuzz'.
Step-by-step explanation:
Lanugo hairs are fine, colorless hairs that cover a fetus's face and body until they are shed close to the time of birth. Therefore, option E) 'exists primarily in fetuses' is the correct statement about lanugo hairs. Lanugo hairs are not deeply pigmented or coarse (option B) and they do not persist throughout the entire life (option C).
Although lanugo hairs can cover most of the body, they are not found on the feet (option A). Lanugo hairs are also referred to as 'peach fuzz' (option D).