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.
An underlying message about life, so basically the overall lesson the author wants the audience to know.
Answer:
3 should go after 4
Explanation:
"We had some trouble the next evening trying to take the heavy garbage can to the curb. The can did not have wheels, so we had to drag it behind us. On the first night, my brother and I watered their flowers using a garden hose"
