Please help! Which detail best supports the main idea?

During the summer, lawn and garden watering make up forty percent of household water use. One easy, inexpensive, and effective way to conserve water is with a rain barrel.

A) For more information on how you can build your own rain barrel, visit www. epa. gov and search for rain barrels.

B) It’s great for watering vegetable plants and flowers around your house. I use it to fill my fish tank, even to wash the car if you want to.

C) I made my own rain barrel but you can buy them pretty cheaply now.

D) One of the benefits of a rain barrel is it holds that first bit of rain that’s coming off the roof or your driveway and prevents it from running into streams and causing erosion from high flows of water.