Stage between boyhood and youth

Answer: Option B

One word substitute is Adolescence.

Puberty: the period during which adolescents reach sexual maturity and become capable of reproduction.
Adolescence: the period following the onset of puberty during which a young person develops from a child into an adult.
Infancy: the state or period of babyhood or early childhood.
Maturity: the state, fact, or period of being mature.