Which of the Following May Be a Factor in How

Which of the following may be a factor in how much a preschooler weighs and how tall he/she is?

A) sex;boys tend to gain more weight and height than girls
B) global economics;children in developing countries like Bangladesh gain weight and height just as quickly as children living in Sweden
C) poverty;U.S.children living in families whose income falls below the poverty level are likely to be larger than children from affluent families
D) the quality of preschool;children who attend quality preschool programs receive better snacks and lunches