rotation of Earth rotation of the Sun revolution of Earth around the Sun revolution of the Sun around Earth
I gave my students this multiple choice question: The length of a year is equivalent to the time it takes for one

Only one answer is correct among these 4 choices:
- rotation of Earth
- rotation of the Sun
- revolution of Earth around the Sun
- revolution of the Sun around Earth

Could you tell me which one is correct?

revolution of Earth around the Sun