A drought that kills most of the grass would have the greatest deleterious effect on this food chain.
The picture shows a food chain that has grass first, Grasshopper second, mouse third, and owl fourth.
According to this graph, if a drought affects the first organism that is grass, the entire food chain would be affected because the grasshopper population would decrease due to lack of food, as well as mice and owls.
So, the correct answer is option D because it mentions the most damaging situation for this food chain.
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