A student recently wrote us: "The third paragraph starts with, "as far back as the nineteenth century." choice D clearly talks about the 1800's which is the 19th century. Definitely a valid choice and should be revised. Thank you."
In the paragraph that you reference, the author is claiming that in the 19th century (1800's) people knew that lead was a dangerous substance but does not specify whether it was restricted to a particular group or widely known. Therefore, answer choice D doesn't weaken or strengthen the author's claim that despite knowledge of the dangers of lead, industry proceeded to allow its use.
Thanks for your question. I hope this helps!
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