A Planet of Constant Mass Orbits the Sun in an Elliptical

Multiple Choice

A planet of constant mass orbits the sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's rotational kinetic energy about the sun's center?

A) It increases continually.
B) It increases when the planet approaches the sun, and decreases when it moves farther away.
C) It remains constant.
D) It decreases when the planet approaches the sun, and increases when it moves farther away.
E) It decreases continually.