During the Period Each Year When We See Mars Undergoing

During the period each year when we see Mars undergoing apparent retrograde motion in our sky,what is really going on in space?

A) Mars is moving around the Sun in the opposite direction from which Earth is moving around the Sun.
B) Earth and Mars are getting closer together.
C) Earth is catching up with and passing by Mars in their respective orbits.
D) Earth and Mars are on opposite sides of the Sun.

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