Human Females Have a Lifespan of Over 80 Years

Multiple Choice

Human females have a lifespan of over 80 years. However, the trait of living for eight decades is somewhat of a puzzle to evolutionary biologists. Why might that be?

A) The genes responsible for long life have not been identified.
B) The lifespan of human females is slightly longer than human males.
C) Women who live to be 80 don't have better relative fitness than women who live to be 50.
D) Long life can be a burden for an individual.