The graph that best demonstrates the change in the frequencies of light-colored moths is C. (dashed line slightly wiggles at the bottom...exponentially decreases)
This refers to the use of lines that has x and y coordinates to represent data on the various planes.
Hence, we can see that from the period 1970, there has been a change in industrial pollution as it reduced and there was a change in the frequencies of light-colored moths and dark-colored moths is option C.
Read more about graphs here:
https://brainly.com/question/14323743