In the Locker Room at the Local YMCA, John Has

In the locker room at the local YMCA, John has noticed that his penis is smaller compared to many other men's. What should John know?

A) There are medications available that have been proven to increase penis size.
B) He may have lower levels of circulating testosterone.
C) There is little relationship between flaccid and erect penis size.
D) Men with smaller penises are less likely to suffer from erectile dysfunction.