Which of the Following is a Secondary Sexual Trait

Question

Which of the following is a secondary sexual trait?  
A) Ovulation in females
B) Pproduction of semen in males
C) Facial hair in males
D) Ovaries in a female
E) Testes in males

Accepted Answer

Secondary sexual traits are traits that differentiate between males and females of a species, but are not directly involved in reproduction. Facial hair in males is a secondary sexual trait.