A) It might be true,but most animals use bright colors to attract a mate. I doubt that any animal would use the brown for attracting its potential mate.
B) No. Fur color has got nothing to do with the organism's internal balance.
C) Yes, some animals have adaptations that help them blend to their surroundings. e.g. Camouflage and Mimicry.
D) I have not heard of any cases that fur color has affected the rate of respiration.
So,the answer here is letter C.