That Polaris Will Not Always Be the Pole Star Is

Multiple Choice

That Polaris will not always be the pole star is due to:

A) the sidereal day being shorter than the solar day.
B) precession shifting the celestial pole.
C) the Moon following the ecliptic, instead of the equator.
D) the Earth's revolution being slightly less than exactly 365.25 days.
E) the Solar winds blowing the Earth farther away from the Sun.