the Moon to revolve around Earth. Earth to revolve around the Sun. Earth to rotate on its axis. the Sun to rotate on its axis.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The length of a year is determined by the amount of time it takes
Possibilities:
- the Moon to revolve around Earth.
- Earth to revolve around the Sun.
- Earth to rotate on its axis.
- the Sun to rotate on its axis.

Earth to revolve around the Sun.