Which of the following statements accurately describes the impact of gender differences on physical growth during the middle childhood years?
a. Girls are heavier and taller than boys through the age of nine or ten.
b. Boys surpass girls in height and weight until about the age of 13 or 14.
c. Beginning at about age 11, boys develop relatively more muscle, and girls develop relatively more fat.
d. Boys experience a steady weight gain through middle adulthood, whereas girls experience an overall weight loss