An appropriate summary for the article "A Most Troublesome Element" is the last option - C. Arsenic is a naturally occurring, poisonous element that has threatened the health of humans since the Middle Ages.
It clearly states what the whole article is about.
<span>d) both, and, everyone
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To my knowledge the correct way to write the date is January 7,2017
Its basically a book that tells u the synonyms( another word for a word), like the word extreme, a synonym for that is extraordinary, and also antonyms( they are the opposites of words) as well, like say for example the word like, the antonym for that is dislike, so basically the opposite of a word, definition. I hope all this information helps u with your question.
