Mars Moves in an Elliptical Orbit Around the Sun

Multiple Choice

Mars moves in an elliptical orbit around the Sun. The Sun is located at

A) the exact center of the ellipse.
B) the focus of the ellipse that is closer to the point where Mars moves fastest.
C) one end of the major axis of the ellipse.
D) the focus of the ellipse that is closer to the point where Mars moves slowest.