Answer:
I believe it is B
Step-by-step explanation:
There has never been a cure for poison ivy, but there is a treatment (so that's wrong)
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John Smith "described" the plants in his journal, making a report (This makes it sound like a nurse, like the "big book of boo boo's" in Doc Mcstuffin, when an illness occurs, she writes them down in a book because she's a physician... kind of a weird way to think of it.)
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We already know that these plants cause uncomfortable reactions, but we need to infer, not know. (so that's wrong)
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It was never said in the paragraph that poison ivy killed a whole tribe, poison ivy hardly kills people today. (so that's also wrong)
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Leaving us with B.