Here's a problem to solve: Two students notice that the constellation Scorpio is directly overhead as they enter a building. When they leave the building several hours later, Scorpio is no longer directly overhead. Which of these statements explains why Scorpio appears to be in a different location?

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

- A: Earth rotates on its axis.
 
- B: Earth revolves around the sun.
 
- C: The stars are moving through space.
 
- D: The gravity of the moon attracts the stars.
 