Mars Is Best Viewed from Earth When It Is at Opposition

Multiple Choice

Mars is best viewed from Earth when it is at opposition, but some occasions are more favorable than others. Why is this?

A) Mars has an elliptical orbit, and favorable oppositions occur when Mars is near perihelion in its orbit, and hence closest to Earth.
B) Mars has an elliptical orbit, and favorable oppositions occur when Mars is near aphelion in its orbit, and hence closest to Earth.
C) Mars's orbit is inclined at a significant angle to the ecliptic, so favorable oppositions occur when it is crossing the ecliptic plane while near opposition.
D) Even though Mars moves in a circular orbit, the orbit of Earth is elliptical, and so favorable oppositions occur when Earth is near perihelion.