Earth to rotate once on its axis the Moon to revolve once around Earth the Sun to revolve once around Earth Earth to revolve once around the Sun
I gave my students this multiple choice question: An Earth year is the length of time it takes for

Only one answer is correct among these 4 choices:
- Earth to rotate once on its axis
- the Moon to revolve once around Earth
- the Sun to revolve once around Earth
- Earth to revolve once around the Sun

Could you tell me which one is correct?

Earth to revolve once around the Sun