Precession of the Rotation Axis of Earth Is Caused by

Multiple Choice

Precession of the rotation axis of Earth is caused by

A) the force of gravity from the sun and moon on Earth's equatorial bulge.
B) the force of gravity from the sun and Jupiter on the Earth-moon system.
C) the magnetic field of Earth.
D) the formation and subsequent melting of glaciers during the ice-ages.
E) the impact of asteroids.