The Inclination of the Axis of the Earth Varies from 22

Multiple Choice

The inclination of the axis of the earth varies from 22 $\degree$ to 24 $\degree$ degrees taking ____ to complete a cycle. This is a factor in the Milankovitch hypothesis of ice ages.

A) 24 hours
B) 1 year
C) 499 years
D) 41,000 years
E) Wrong! The Earth's axis tilt is fixed at exactly 23.50 with no variation whatsoever.