Which of the Following Alternatives Offers the Most Accurate Assessment

Multiple Choice

Which of the following alternatives offers the most accurate assessment of the origin of familial retardation in nature on the one hand or nurture on the other?

A) Familial retardation is almost always genetic in origin,thereby reflecting nature.
B) About 1/3 of the cases of familial retardation have a known basis in biology,or nature.
C) Familial retardation is most often environmental in origin,such as extreme continuous poverty leading to malnutrition.
D) Whether familial retardation is caused by environmental factors or some genetic factor is usually impossible to determine.