Task: Question Answering
Input (English): 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?  
 (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.
Output (English): B