Sarah Is a Junior High Student Anticipating and Preparing for Puberty

Sarah is a junior high student anticipating and preparing for puberty. She wants to know when puberty will start and how long it will take until she looks and is considered an adult. What would you tell her?

A) The timing of puberty, as well as the rate with which it occurs, is highly variable and is influenced by both genetic and environmental factors.
B) The timing of puberty, as well as the rate with which it occurs, is highly predictive. She will begin the puberty process around 12.5 years of age and it will take four years until it is completed.
C) The timing of puberty, as well as the rate with which it occurs, is highly controllable.
D) The timing of puberty, as well as the rate with which it occurs, is predetermined by your DNA.