Ans. (A). Proteins expressing color in butterfly wings mutate to improve camouflaging abilities of butterflies.
Adaptation is described as permanent change in organism due to mutation that leads to better survival of that organism.
Camouflage helps the butterfly to hide in its surrounding environment to avoid predators. So, if a mutation leads to expression of protein in butterfly's wings that improve camouflage in butterfly will show an adaptation as would lead to increased survival of that butterfly population.
Thus, the correct answer is option (A).
