Answer and explanation

Correct answer: D. The tilt of Earth's axis as it orbits the Sun

  1. Step 1: Earth's axis is tilted relative to its orbit. Step 2. The tilt changes how directly sunlight reaches each hemisphere. Answer: The tilt of Earth's axis as it orbits the Sun. Why not the others: Distance changes are small, the Moon does not cause seasons and the Sun's size does not change yearly.

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