Almost All Peppered Moths in England Were Light Colored Before

Almost all peppered moths in England were light colored before the Industrial Revolution. However, some dark forms were collected-the dark color is determined by a single, dominant allele of one gene. The bark of trees became darker during the Industrial Revolution in areas where heavy coal use in factories caused pollution. By about 1900, approximately 90% of the moths around industrial areas were dark, whereas light-colored moths were still abundant elsewhere. Apparently, birds could readily find the light moths against the dark trees in industrial areas and, therefore, were eating more light moths. Recently, use of cleaner fuels has resulted in tree bark becoming lighter again and the dark-colored moths have been disappearing. Which of the following statements best explains whether we should consider the forms different species?

A) They are different species-as shown by the fact that natural selection has affected the frequency of the two forms.
B) They are different species-as shown by the fact that the two forms are reproductively isolated by habitat.
C) They are NOT different species-as shown by the fact that they live in the same habitats.
D) They are NOT different species-as shown by the fact that they can interbreed.