In a grassland food chain, the maximum accumulation of a chemical pesticide would be found in:
Hawk
Pesticides that enter a food chain are not easily broken down, so their concentration increases at every higher trophic level -- a process called biomagnification.
In the food chain grass -> grasshopper -> frog -> hawk, the hawk is the top (apex) predator and therefore accumulates the maximum concentration of the pesticide.
Hence, this is the correct answer.
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