The correct response is:
The Southern Hemisphere receives less direct sunlight during its summer.
This explanation reflects the fact that seasons are caused by the tilt of Earth's axis relative to its orbit around the sun. When it is summer in the Northern Hemisphere, the Northern Hemisphere is tilted toward the sun and receives more direct sunlight, while simultaneously, the Southern Hemisphere is tilted away from the sun, receiving less direct sunlight, resulting in winter there. Conversely, during the Southern Hemisphere's summer, the Southern Hemisphere is tilted toward the sun, receiving more direct sunlight, while the Northern Hemisphere experiences winter.