Task: Question Answering
Input (English): Ptolemy was an ancient astronomer who thought Earth was the center of the universe. When he made observations that were inconsistent with this, he proposed a phenomenon called "epicycles" to explain the observations. How was Ptolemy's process similar to the modern scientific process?  
 (A) Ptolemy based his model partly on a belief system. (B) Observations inspired Ptolemy to modify his explanations. (C) Ptolemy tried to describe the universe instead of explaining it. (D) Experiments were the basis of Ptolemy's model of the universe.
Output (English): B