The Term "Retrograde Motion" for a Planet Refers to the

Multiple Choice

The term "retrograde motion" for a planet refers to the

A) temporary reversal of the planet's normal east-to-west motion past the background stars as seen from Earth.
B) apparent motion of a planet's moon in the opposite direction to the motion of the planet itself during half of each orbit of the moon around the planet.
C) temporary reversal of a planet's direction of spin about its axis of rotation.
D) temporary reversal of the planet's normal west-to-east motion past the background stars as seen from Earth.