The Mother of a 10-Year-Old Boy Asks the Nurse to Explain

The mother of a 10-year-old boy asks the nurse to explain the onset of puberty.The nurse should reply by saying:

A) "Puberty usually begins around 15 years of age."
B) "The first sign of puberty is an enlargement of the testes."
C) "The penis size does not increase until about 16 years of age."
D) "The development of pubic hair precedes enlargement of the testicles or penis."