You Overheard Your Little Sister and Her Best Friend, Who

You overheard your little sister and her best friend, who are both 8 years old, discussing what they thought about puberty and when they thought those changes would begin for them.Your sister is thin and her friend is considerably heavier.What is likely to occur in terms of the beginning of puberty for them?

A) They will both begin puberty at the same time.
B) Your sister, being thinner, is likely to begin puberty earlier.
C) Your sister's friend, having more body fat, is likely to begin puberty earlier.
D) They are not likely to be talking about puberty at this age.