Which of the Following Is Not an Explanation of the Differences

Which of the following is not an explanation of the differences in SAT scores between students from different socioeconomic classes and races?

A) Poor parents, most without health insurance, are unable to afford prenatal care, which increases the risk of babies being born at low birth weight, a condition that may lead to learning disabilities.
B) Poor children are less likely than more affluent children to receive adequate nutrition, decent medical care, and safe and secure environment, which increases the probability of their being less alert, less curious, and less able to interact effectively.
C) Poor families are less likely to enroll their children in private early development programs that are available and accessible to them.
D) Poor children are more likely to drop out of schools prematurely and go to work because school supplies, meals, transportation, and various school programs are costly.