What Was Ptolemy's Solution to the Problem of Retrograde Motion

Multiple Choice

What was Ptolemy's solution to the problem of retrograde motion in a geocentric Universe?

A) That each planet moves in small circles called epicycles as it follows its larger orbit
B) That some of the celestial spheres really did slow and reverse direction regularly
C) That some planets could slide around on the celestial spheres
D) That observations of retrograde motion had been made incorrectly