Which of the Following Was a Finding by the U

Which of the following was a finding by the U.S. National Longitudinal Survey of Youth?

A) Mothers with lower intelligence test scores tend to have larger families than mothers with higher scores.
B) Mothers with small families are usually less well-off economically than mothers with larger families.
C) First-born children in large families are more intelligent than their younger siblings.
D) Only children have lower intelligence test scores than children with siblings.