Which of the following best describes pubertal timing? a. The average age of menarche is much later today than it was in earlier generations. b. Menarche takes place as late as age 15 in some...

Which of the following best describes pubertal timing?

a. The average age of menarche is much later today than it was in earlier generations.

b. Menarche takes place as late as age 15 in some developing countries, due to lack of proper nutrition and medical care.

c. The timing of puberty has no effect on adolescent boys.

d. The effects of early maturation are generally positive for girls.