How Have Advancements in Our Understanding of Human Genetics and Human

How have advancements in our understanding of human genetics and human evolution complicated the concept of race?

A) Analysis of DNA reveals that humans living in different parts of the globe descended from different hominin species.
B) Analysis of human DNA across the globe has revealed that there are dramatic differences in the DNA code of people living in different regions.
C) Genetic analysis has revealed that racial differences between people are biologically significant.
D) DNA analysis has revealed that people of different races are almost genetically identical and that racial differences are simply the result of relatively recent adaptations and random variation.