Correct Answer: (b) Increase in doses of pesticides to prevent the resurgence of pests that were being controlled
Solution:The term pesticide treadmill describes the phenomenon whereby pesticide use prevents any natural form of control from taking place, thereby resulting in the need for repeated, routine applications of pesticide. The pesticide treadmill is said to escalate when the control of one pest provides a window of opportunity for other pests and the need for further chemicals. In short, there is an increase in doses of pesticides to prevent the resurgence of pests that were being controlled. Thus, option (b) is the correct answer.