Earth to travel halfway around the Sun. the Moon to travel halfway around Earth. Earth to complete one orbit around the Sun. the Moon to complete one orbit around Earth.
I gave my students this multiple choice question: It takes 365 days for

Only one answer is correct among these 4 choices:
- Earth to travel halfway around the Sun.
- the Moon to travel halfway around Earth.
- Earth to complete one orbit around the Sun.
- the Moon to complete one orbit around Earth.

Could you tell me which one is correct?

Earth to complete one orbit around the Sun.