A nurse is assessing the sexual maturity of a 14-year-old male during a routine check-up. Based on Tanner's stages of sexual development, which of the following characteristics would the nurse expect to observe in a male at Tanner stage 3?

A. Enlargement of the testes and scrotum with the appearance of pubic hair is characteristic of Tanner stage 2, which marks the early stages of puberty. This is when initial changes in the genitalia and pubic hair begin. B. Penile enlargement and deepening of the voice is correct because these changes occur during Tanner stage 3, representing continued pubertal development. Stage 3 includes further growth of the penis, continued enlargement of the testes, increased pubic hair that is darker and coarser, and the beginning of voice changes. C. Increased muscle mass and facial hair growth is incorrect because these changes are more characteristic of Tanner stage 4–5, the later stages of puberty, when secondary sexual characteristics become more pronounced. D. Full development of genitalia and the growth of axillary hair is incorrect because this represents Tanner stage 5, which indicates full sexual maturity and adult genital development.