Here's a problem to solve: Students are studying how the positions of Earth and the Sun effect changes on Earth. After four seasons have passed on Earth, which has happened?

Among the 4 following options, which is the correct answer?

- A: Earth has completed one rotation around the Moon.
 
- B: Earth has completed one revolution around the Sun.
 
- C: The Sun has completed one revolution around Earth.
 
- D: The Moon has completed one revolution around Earth.
 