Is it a good way to think that E would be correct if the question asks "which one of the following is an assumption required by the science writer's CONCLUSION?"

#help

admin. note: added #help

Why is A incorrect?

Yes. It's on the LSAC Website

I am not 100% sure about why not choosing Answer Choice E because if the poison is put into food sources that are eaten by rodents but not by grey squirrel, the officials fail to eliminate the squirrels with the poison.#help

I still don't understand why A is the correct answer.