Question: 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?

  Options: 
 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. 
Answer: B