The Results of the Carolina Abecedarian Project Indicate That Intervention

The results of the Carolina Abecedarian Project indicate that intervention programs

A) with disadvantaged children do not improve their IQ scores.
B) that focus only on preschoolers work as well as long-term intervention programs.
C) that focus on the school environment work as well as programs that focus on both the school and home environments.
D) are most successful when they last for years and they focus on both the school and home environments.