Question: The early Greeks are credited with many valid concepts in astronomy. Some of their theories were correct; some were later proven incorrect. One theory was that Earth was the center of the universe and that other planets circled Earth. The Greeks thought Earth did not move because its movement was not obvious from the surface of the planet. The Greeks also believed that an invisible sphere surrounding our planet contained the stars. This sphere rotated, explaining the apparent movement of constellations over time. Which celestial motion is responsible for the phases of the moon?

  Options: 
 A. the moon revolving around Earth
 B. Earth revolving around the sun
 C. the moon rotating on its axis
 D. Earth rotating on its axis 
Answer: A