The Purpose of Using Epicycles and Deferents to Explain the Motion

Multiple Choice

The purpose of using epicycles and deferents to explain the motion of the planets in the night sky was to account for

A) prograde motion.
B) Mercury's and Venus's limited angular distance from the Sun.
C) retrograde motion.
D) non-uniform speed of the planets in their orbits.
E) precession of the equinoxes.