Precession of Earth's Spin Axis Results In

Precession of Earth's spin axis results in:

A) changes of the positions of the constellations that are visible at night from Earth over the period of one year.
B) a gradual shift of the vernal equinox along the ecliptic.
C) a daily shift in the position of the overhead direction (the zenith) of an observer relative to the celestial equator (for an observer at a fixed location on Earth) .
D) a gradual change in the angle between the ecliptic and the celestial equator.