The Tropical Year Is About 20 Minutes Shorter Than the Sidereal

The tropical year is about 20 minutes shorter than the sidereal year. What does this tell you about precession?

A) The vernal equinox moves eastward along the ecliptic.
B) The vernal equinox moves westward along the ecliptic.
C) The vernal equinox remains fixed on the ecliptic, but the Sun progressively changes its apparent position against the background stars from one sidereal year to the next.
D) This time difference has nothing to do with the precession of the equinoxes.