The correct answer is option (E):
control ... resurgence
The correct answer is "control ... resurgence" because it creates a logical and coherent sentence. Let's break down why:
The sentence discusses the negative consequences of using chemical insecticides. We need words that fit the context of pest management.
* "Unscrupulous use of chemical insecticides to control the pests..." - This part of the sentence establishes the intended action: using the insecticides to manage pest populations. "Control" directly relates to the goal of reducing or eliminating pests.
* "...leads to pest resurgence." - "Resurgence" means a renewed increase or revival of something, in this case, the pest population. This describes the unintended consequence of using insecticides: the pests come back, often stronger or more numerous, after the initial application. This is because the insecticides may kill off natural predators of the pests, or the pests may develop resistance.
Let's look at why the other options are incorrect:
* "aggravate … modification" - "Aggravate" means to make a problem worse. While chemical use can make the problem worse, the second word "modification" doesn't fit the context of pest population dynamics.
* "disintegrate … mobility" - "Disintegrate" means to break apart. While insecticides can break down pests, the second word "mobility" doesn't relate to the idea of pest population behavior.
* "rectify … revival" - "Rectify" means to correct or fix. This doesn't fit the context of how insecticides are typically used, and "revival" seems redundant because "resurgence" already implies a return.
* "kill … stimulation" - "Kill" is a basic function of insecticides, but "stimulation" doesn't make sense as a consequence related to pest population.