Why Is Recent Genetic Research Promising in Terms of Isolating

Multiple Choice

Why is recent genetic research promising in terms of isolating the genetic influence on sexual orientation?

A) It includes comparisons between heterosexual and homosexual siblings' genetic codes.
B) It compares homosexual children's genetic codes to their heterosexual parents.
C) The findings are hard to contest.
D) Once a gene has been found to influence sexual orientation,there is no question of its presence in all sexual minority people.