Here's a problem to solve: Early Egyptians thought the solar system was a rectangular box. People in early Greece pictured the universe as a set of crystal-like spheres. Later the solar system was viewed as a set of planets orbiting the Sun. Why has the model of the solar system changed over the centuries?

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

- A: Scientists preferred newer models.
 
- B: New evidence caused revisions.
 
- C: The newer models were easier to draw.
 
- D: The information was finally put in books.
 