Which Statements Does NOT Accurately Describe the Effect of Enriched

Which statements does NOT accurately describe the effect of enriched environments on IQ

A)  Educational enrichment programs (e.g., Head Start) generally have not produced substantial, long-term gains in IQ. 
B)  The inability of enrichment programs to produce enduring increases in IQ indicates that intelligence is largely a product of heredity. 
C)  Some adoption studies have demonstrated that an improved environment can lead to meaningful increases in IQ. 
D)  The failure of enrichment programs to increase IQ scores may be due to the fact that the programs were poorly executed, or underfunded.