Which of the following is one conclusion of the NICHD longitudinal study?

A. Infants from families with better financial situations are more likely to enter nonmaternal child care than those from lower-income families.
B. Children in day care are less socially competent than those with maternal care regardless of care quality.
C. The parents' influence is weakened by increased time in day care.
D. High-quality day care influences cognitive ability.

D. High-quality day care influences cognitive ability.