The Reason That the Eccentricity of the Orbit Is Neither

Multiple Choice

The reason that the eccentricity of the orbit is neither equal to nor greater than 1 is because
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A) The speed of a planet around the sun is a constant.
B) The motion of a planet lies in a plane.
C) The planet has closed orbits.
D) The force between a planet and the sun is a constant.
E) The position of the planets is unrelated to the sun.