The Sun is closer to Earth in the summer than in the winter. The Sun has more sunspots in the summer than in the winter. Earth's western hemisphere is tilted toward the Sun during the summer. Earth's northern hemisphere is tilted toward the Sun during the summer.
I gave my students this multiple choice question: Which statement best explains why summer days are warmer than winter days in Arkansas?

Only one answer is correct among these 4 choices:
- The Sun is closer to Earth in the summer than in the winter.
- The Sun has more sunspots in the summer than in the winter.
- Earth's western hemisphere is tilted toward the Sun during the summer.
- Earth's northern hemisphere is tilted toward the Sun during the summer.

Could you tell me which one is correct?

Earth's northern hemisphere is tilted toward the Sun during the summer.