Which of these is the source of the variation in wing color within the Peppered Moth population or in other words, how do they get their wing color? A. natural selection
B. genetic variation
C. pollution

Genetic variation

Explanation: It could lead to natural selection, but natural selection isn't the cause. Many years down the road you could see a particular variation having a higher population, which is the result of natural selection/survival of the fittest via better camouflaging from predators.