The correct answer is D.

Explanation:

The sentence is incomplete, but it appears to be discussing the potential negative effects of pesticides on people's health. The blank space after "people's" suggests that we need to choose a word that completes this thought.

Option A ("pests") does not make sense in the context of the sentence.

Option B ("farmers") is incorrect because farmers are the ones who spray the pesticides, not the ones who may suffer health damage from them.

Option C ("crops") is also incorrect because the sentence is focusing on the impact of the pesticides on people's health, not on the crops themselves.

Option D ("lives") is the best choice because it provides a logical and grammatically correct completion to the sentence, indicating that pesticides can harm people's lives/health.