the position of the Sun. the position of the Moon. Earth's angle of tilt Earth's distance from the Sun
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The length of time between night and day on Earth varies throughout the year. This time variance is explained primarily by
Possibilities:
- the position of the Sun.
- the position of the Moon.
- Earth's angle of tilt
- Earth's distance from the Sun

Earth's angle of tilt