The answer to your question is A
Number 4 because if you do the thing then you will get 0
To do this, multiply 9 by 18. This will show you how much they all weigh if there are 18 and each is 9 pounds.
The answer is 162.
Hope this helps!
It's probably the first one: "People responded to Earth Day with letters..."
Since it's more of a detail that supports a fact, it's not as important as the other three.
