Researchers Studying Variations in Oldfield Mouse Coat Color Found That

Researchers studying variations in oldfield mouse coat color found that the light coat color of many beach populations was due to a

A) mutation in the Mc1R protein, which reduces the ability of a-MSH to bind.
B) mutation in the regulatory region of the Agouti gene, which increases ASP expression.
C) reduction in eumelanin production.
D) All of the above