How Could Planting Bt Corn Lead to Even More Pesticide

How could planting Bt corn lead to even more pesticide use?

A) Bt-resistant pests thrive when Bt-susceptible pests are no longer competition,so it takes more pesticide to get rid of them.
B) Bt corn doesn't actually produce Bt-it just means that the plants are Bt resistant-so farmers still have to use the pesticide to rid the corn of pests.
C) Bt corn repels beneficial insects,which usually kill all of the pests,so now farmers must use pesticide.
D) Bt corn actually depends on pesticide use to grow and survive.
E) Bt corn does not lead to more pesticide use,as the Bt toxin produced by the plant is sufficient to kill all natural pests.