Which of the Following Is an Explanation for the Universal

Which of the following is an explanation for the universal nature of the incest taboo?

A) It enhances sexual competition in families by restricting sex to intimate partners.
B) It reduces the ability to define people's rights and obligations toward each other.
C) It allows hopeless confusion of kinship lines.
D) It limits the expansion of families, helping to avoid integration into the larger society.
E) It reduces the odds of producing offspring with mental or physical problems.