Answer: I believe the answer is B. Mice changed their coat color to match their environment.
Step-by-step explanation:
Some species of mice are masters of disguise. The natural brown or grey coat of a mice is perfectly made to hide among both country nature and city corners. Deer mice living in the Nebraska sandhills were able to mutate to change the colors of their coats from their original grey to a soft brown -- perfect for blending in with the sandy surroundings.