Question

Read the paragraph.

Water is an important resource that people take for granted. A typical American household uses one hundred gallons of water a day.

If added at the end, which sentence would complete the paragraph by connecting back to the topic?

The average American household spends over $500 a year on water.
With a little effort, people could easily protect this resource by conserving it.
Another resource that people should think about protecting is energy.
Since seventy percent of the Earth is covered by water, there is a lot of water around

Answer 1

"With a little effort, people could easily protect this resource by conserving it."

This directly ties back to the opening claim that water is taken for granted and follows naturally from the fact about household use by offering a way to protect the resource. The other choices either shift topics (energy), give an unrelated fact (cost), or downplay the concern (there's a lot of water).