The Majority of Early-Intervention Programs in the 1960s That Were

The majority of early-intervention programs in the 1960s that were designed to enhance the intellectual development of poor children

A) were well-planned, large-scale programs.
B) initially increased children's IQ scores substantially.
C) were ineffective in preventing assignment to special-education classes and decreasing the likelihood of being held back a year in school.
D) had long-term effects on IQ scores.