Question

which land use tends to keep urban areas coolest in summer?
parking lots
commercial districts
parks and green spaces
downtown streets

Explanation:

Parks and green spaces have vegetation (like trees, grass) which provides shade, and plants also undergo transpiration (releasing water vapor) that cools the air. Parking lots (asphalt/concrete) absorb heat, commercial districts have buildings/impervious surfaces that retain heat, and downtown streets (concrete/asphalt) also absorb heat. So parks and green spaces help keep urban areas cooler in summer.

Answer:

B. Parks and green spaces