Read the passage: so not only is the rain barrel water free, but it’s also free of chlorine and minerals so it’s really great for your plants and vegetables. which best explains how the passage supports the message: a rain barrel is a small investment for big dollar and environmental benefits?

it explains that water collected in a rain barrel doesn't cost you anything.

it explains that water free of chlorine and minerals is better for plants.

it explains one way rain barrels benefit you, and one way rain barrels benefit plants.

it explains that the water is healthy for both humans and plants.