This process takes place when large areas of land are developed as more and more people move to cities and suburbs.
urbanization
deforestation
desertification
land reclaimation

I believe it is urbanization

After looking at the graph represented above, I think I habe recognized the correct answer,  so the statement  which would best predict the population in generation 4 is being shown in the first option : The nonresistant aphid would become extinct. As you can see from the tree pictures, nonresistant ones gradually become lower and lower and in the last one it has the same weak position as resistant in the first picture, then I would say that nonresistant will expire soon.

Hope that helps!