Which change occurs during puberty for boys?

• A. Testicles & penis get bigger; hair grows in pubic area & armpits; muscles grow, voice deepens, facial hair develops
• B. Breasts develop
• C. Periods begin
• D. Hair grows on arms

Answer: (A)

Puberty in boys is driven by testosterone and shows up as physical changes that signal sexual maturation. The most characteristic shifts include growth of the external genitalia (testicles and penis), the appearance of pubic and underarm hair, an increase in muscle mass, a deeper voice, and the development of facial hair. The option that lists these exact changes—enlarged testes and penis, growth of pubic and underarm hair, plus stronger muscles, a deeper voice, and facial hair—best fits male puberty. Other options describe changes typical of female puberty (breasts developing, periods) or non-specific hair growth, which aren’t defining features of puberty for boys.