With Unilineal Descent,sex with Cross Cousins Is Proper,but Sex with Parallel

Multiple Choice

With unilineal descent,sex with cross cousins is proper,but sex with parallel cousins is considered incestuous.Why?

A) Cross cousins are actually parallel cousins.
B) Societies with unilineal descent share a gene that impedes them from developing sexual urges for parallel cousins.
C) This behavior is a human universal explained by Freud's theory of attempt and contempt.
D) Cross cousins are considered closer relatives than all other kin.
E) Parallel cousins are considered closer relatives than cross cousins.