Earth's tilt on its axis the Sun's tilt on its axis Earth spinning on its axis the Sun spinning on its axis
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The length of daylight changes as the seasons change during the year. What causes these changes in daylight?
Possibilities:
- Earth's tilt on its axis
- the Sun's tilt on its axis
- Earth spinning on its axis
- the Sun spinning on its axis

Earth's tilt on its axis