What May Be a Factor in How Much a Child

What may be a factor in how much a child weighs and how tall she or he is?

A) sex;boys tend to gain more weight and height than girls
B) global economics;children in developing countries gain weight and height faster than children living in economically developed countries
C) poverty;U.S.children living in poorer families are likely to be taller and heavier than children from affluent families
D) quality of preschool;children who attend good-quality preschool programs receive better snacks and lunches