Psychologists Who Study Children's Cognitive Development in a Range of Environments

Psychologists who study children's cognitive development in a range of environments have found that ____.

A) the cognitive skills of disadvantaged children can be improved by providing the children with extra lessons, stimulating materials, and educational contact with sensitive adults
B) preschool programs have robust and enduring effects
C) the environment does not influence cognitive development beyond the first two years of life
D) once intellectual development has been impaired, there is no hope of reversing the damage