How Would the Evolutionary Point of View Explain Why Sex

How would the evolutionary point of view explain why sex between relatives is such a universal taboo?

A) Conception is less likely to occur with a close relative than a non-relative.
B) Avoiding sex with close relatives decreases the chance of passing on a defective gene.
C) Jealousy is more likely to occur with a close relative than a non-relative.
D) Survival of a group is increased if the bonds between group members stay within the group.

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