Every pesticide develops its own failure as its repeated use leads to:

Question

Accepted Answer

The development of resistant pest varieties. A is correct because repeated pesticide use selects for pests that can survive the chemicals. B is incorrect because pesticides usually affect multiple trophic levels, not just simplify the web in a predictable way. C is incorrect because while some pesticides harm birds, this is not the primary failure mechanism described. D is incorrect because pesticides target pests, and their effect on weed populations varies and is not the main outcome of overuse.