Studies Using Sameroff's Environmental Risk Scale Have Demonstrated That

Studies using Sameroff's environmental risk scale have demonstrated that:

A) the number of risks in a child's environment is a better predictor of IQ than any single risk alone.
B) an unemployed head of household is the strongest risk factor for low IQ.
C) maternal anxiety is the strongest risk factor for low IQ.
D) environmental risks have only short-term effects on children's intellectual development.