In the Context of Genes as a Potential Source of Sexual

In the context of genes as a potential source of sexual orientation:

A) genes are irrelevant as a possible source or cause of sexual orientation.
B) twin studies show how the combination of genetics and interactive biopsychosocial sources may explain sexual orientation.
C) it is scientifically possible to establish connections between genes and behavioral traits,including sexual orientation.
D) the occurrence of sexual orientation involves one gene which produces the effect of attraction to one gender or the other.
E) timing and maturation of the human body is not necessary for the development of sexual orientation.