The Genetic Explanation That Accounts for the Incest Taboo Must

The genetic explanation that accounts for the incest taboo must be considered in light of modern genetic research.Which statement is most consistent with a modern understanding of genetics?

A) While people in the past speculated that close breeding was harmful at an individual level,we can now prove it beyond a shadow of a doubt.
B) While close breeding is mostly harmful at an individual level it also has benefits that show over time.
C) Close breeding can actually increase desired characteristics.
D) Modern genetic research has proven inbreeding to be absolutely neutral,with no positive or negative effects.