Research That Supports Environment More Strongly Than Heredity as a Factor

Research that supports environment more strongly than heredity as a factor in student achievement most consistently emphasizes that

A) conclusions supporting heredity are based more in the bias of the researcher than in the evidence of the research.
B) heredity has never been accepted as the most influential factor in determining human intelligence.
C) in situations where the environment for achievement was positively altered, achievement for groups in such situations improved over time.
D) we have no knowledge about intelligence as a genetically determined trait.