Early Psychological Research Concluded That Early Childhood Experiences - Including

Early psychological research concluded that early childhood experiences - including childhood sexual abuse or unresolved pre-Oedipal conflicts - were the reason why some individuals are homosexual.What has recent research found?

A) Recent research has completely dispelled the fact that sexual orientation has anything at all to do with environmental influence.
B) Recent and more reliable research has failed to find any aspects of parenting or environment that predicts homosexual orientation later in life.
C) Recent research, particularly that discovered by the Human Genome Project, has identified "sexual orientation" genes, so that it is possible to accurately predict who will be homosexual in adulthood.
D) Recent research has identified that sexual orientation is completely mediated by the frontal lobes of the cerebrum, which is why we don't often become aware of our sexuality until well after puberty begins.