A farmer growing potatoes notices aphids, a type of insect, feeding on his plants. An insecticide is sprayed several times over a 2 year period. The graph below represents 3 generations of insecticide-resistant and nonresistant aphids over this time period. In year 3, the farmer discontinued the use of the insecticide. Which statement would best predict the population in generation 4?

the nonresistant aphid would become extinct

the nonresistant aphid population would likely increase

the resistant aphid would mutate to a nonresistant aphid
The plants would be free of all insect populations