Which Statement Best Describes the Impact of Genetics and Environment

Which statement best describes the impact of genetics and environment on a child's IQ?

A) At age two,maternal IQ best predicts the IQ of a child;by age four,the impact of the quality of the home environment becomes as good a predictor as maternal IQ.
B) At age two,the quality of the home environment best predicts the IQ of a child;by age four,maternal IQ becomes as good a predictor as the quality of the home environment.
C) At age two,paternal IQ best predicts the IQ of a child;by age four,the impact of the quality of the home environment becomes as good a predictor as paternal IQ.
D) At age two,the quality of the home environment best predicts the IQ of a child;by age four,paternal IQ becomes as good a predictor as the quality of the home environment.