The Concept That Genotypes Are Not the Only Things That

The concept that genotypes are not the only things that control traits involves the fact that

A) dizygotic twins are virtually genetically identical while fraternal twins are not.
B) each genotype can produce a variety of phenotypes, depending on the environment in which a person lives.
C) recessive genes are more commonly expressed than dominant genes, especially in cases of polygenic inheritance.
D) the environment has little impact on behavior, as has been demonstrated in the results of the nature-nurture question.