Planets Go Around the Sun in Elliptical Orbits $F_{\perp}$ Are the Components of the Force Parallel (Tangential) and Perpendicular

Multiple Choice

Planets go around the sun in elliptical orbits. The highly exaggerated diagram below shows a portion of such an orbit and the force on the planet at one position along that orbit. The planet is moving to the right. F|| and $F_{\perp}$ are the components of the force parallel (tangential) and perpendicular (normal) to the orbit. The work they do is W|| and $W_{\perp}$ . At the position shown:

A) W|| slows the planet down; $W_{\perp}$ speeds it up.
B) W|| slows the planet down; $W_{\perp}$ does no work on it.
C) W|| speeds the planet up; $W_{\perp}$ does no work on it.
D) W|| speeds the planet up; $W_{\perp}$ slows it down.
E) W|| does no work on it; $W_{\perp}$ speeds the planet up.