Steroid Drugs, Including Natural Androgens and So-Called Designer Drugs, Are

Steroid drugs, including natural androgens and so-called designer drugs, are illegal in athletic competitions. The main reason is that steroids

A) decrease athletic performance, making games less interesting.
B) increase physical strength, giving users an unfair advantage.
C) cause side effects that decrease differences between genders.
D) cause side effects that increase differences between genders.
E) improve the physical and mental health of users.