Why Would a Mechanism Have Evolved to Reduce Sexual Feelings

Why would a mechanism have evolved to reduce sexual feelings between brothers and sisters?

A) Brothers and sisters typically do not get along, so they would not make good mates.
B) Brothers and sisters have personalities too similar for them to be attracted to one another.
C) Mating between brothers and sisters might lead to a child possessing harmful recessive genes.
D) Mating between brothers and sisters results in the decreased propagation of their parents' genes.

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