One of the Main Obstacles in Implementing the Infant Health

One of the main obstacles in implementing the Infant Health and Development Program (IHDP) , that likely reduced its effectiveness, was...

A) that African American participants were disproportionately from low-income families.
B) that many mothers offered the free services did not participate in the program.
C) that parents could not find reliable transportation to the services that were offered
D) that most of the children were low birth weight and had other medical problems affecting their cognitive and motor development.