Read the passage:
a rain barrel collects and stores water from your roof. instead of running off into storm drains and sewers, that water can be put to good use.
which best explains how this passage supports the message that rain barrels conserve water?

it suggests that water is wasted when it runs into drains and sewers.

it explains how many rain barrels you should have.

it explains why rain barrel water is ideal for human consumption.

it explains how water can be used efficiently instead of wastefully.