Pesticide Use Has Grown a Great Deal in the Past

Pesticide use has grown a great deal in the past century, and similar to the plant-herbivore evolutionary "arms race":

A) increased use of pesticides is leading to increased rates of resistance.
B) widespread chemical treatments pose little concern because they wipe out all existing herbivores.
C) pesticides are killing pests and their predators, reducing the overall level of herbivory in crop plants.