Which of the Following Statements Suggests That Rising Levels of the Protein

Which of the following statements suggests that rising levels of the protein leptin is an important signal that tells the body it is ready for puberty?

A) Production of pubic hair relates to increased sex drive.
B) Excessive thinness can delay onset of puberty.
C) Poorer adolescents tend to go through puberty earlier than non-poor adolescents.
D) Excessive exercise promotes early physical development.