Answer:
The correct answer would be human-induced environmental changes.
Step-by-step explanation:
The natural selection of the peppered moth is a metamorphic event of a color change in the moth population. It was a result or aftereffect of air pollution during the Industrial Revolution.
Coal fires and industrial revolution cause heavy air pollution. In result, lichens get killed and trees become darker that leads the natural selection of these months.
Thus, the correct answer is human-induced environmental changes.