In What Fundamental Way Did the Work of Galileo Differ

In what fundamental way did the work of Galileo differ from his predecessors who had thought about the sky?

A) Galileo consulted many authorities before coming to scientific conclusions, instead of working on his own
B) Galileo translated the works of the ancient Greek astronomers, and relied on their wonderful abilities to think through difficult problems
C) Galileo used instruments and experiments to show him what nature was doing, instead of relying on pure logic
D) Galileo relied on the revelations of the Bible to tell him what was happening in the sky
E) Galileo believed that the Earth was the center of the solar system, and everything revolved around it