The correct answer is letter B: adolescence.
Adolescence brings with it puberty, for both boys and girls. And this period of life comes with big psychological and especially physical changes.
Puberty happens around 10-11 years for girls, and 11-13 for boys. Girls start developing breast and curves, they get their first period, the hormone levels increase. Boys start developing the external genitals and pubic hair starts growing, getting darker and thicker over time, they also start getting a deeper tone of voice. And both girls and boys start getting taller.