Which of the Following Is True About the Factors Influencing

Which of the following is true about the factors influencing homosexuality?

A) Recent research shows that parenting style is the most influential in determining if someone is homosexual.
B) Theories suggesting biological influences on sexual orientation have been disproven.
C) Genetics appear to be involved in determining sexual orientation.
D) Scientists have isolated a specific gene which seems to be the primary factor in determining sexual orientation.