A rain garden can help in what?

Correct answer: Allowing rainwater to soak into the ground

The governing concept is sustainable stormwater management. A rain garden is a shallow, planted depression designed to receive rainwater from roofs, driveways, or other hard surfaces. Plants, roots, and soil slow the movement of water and allow part of it to infiltrate into the ground. This can reduce surface runoff, erosion, and local waterlogging, while also supporting groundwater recharge where soil and site conditions are suitable. It does not function by increasing air pollution, producing plastic waste, or increasing electricity use. Therefore, option C is correct. The result may vary with soil, rainfall, maintenance, and design, but infiltration is the intended basic function.