Gravity is a long-range force, and its effect can be seen in each of the following cases EXCEPT ONE. Which is the EXCEPTION?
A) Globular clusters move in orbits about the center of the Milky Way.
B) A recently discovered member of the Local Group, Canis Major Dwarf, a close companion of the Milky Way Galaxy, is being disrupted by tidal forces from the Milky Way.
C) Clusters of galaxies are bound systems.
D) Superclusters of galaxy clusters are bound systems.
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