In a Population of Moths, Wing Color Became Darker Over

Multiple Choice

In a population of moths, wing color became darker over time. Which of the following is the best evidence that the change in wing color was an evolutionary change?

A) The size of the moth population changed.
B) The average length of the moths' dark wings increased.
C) The number of eggs that females laid during each breeding season increased
D) The frequencies of the alleles for dark wing color in the moth population changed.