Why Was It Informative for Researchers Studying Evolution of Oldfield

Multiple Choice

Why was it informative for researchers studying evolution of oldfield mouse coat color to find the genes responsible for the light coat color of many beach populations?

A) Natural selection can only result in evolutionary change if variation in the trait of interest has a heritable, genetic component.
B) The only way to understand trait evolution is to determine the molecular mechanism of change.
C) If light coat color is caused by the same gene in all of the beach populations, this would mean that it did not evolve from dark-colored coats.
D) Knowing the genetic basis of coat color in the different populations allowed the researchers to determine the norm of reaction for this trait.