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39. According to the passage, which of the following statements best describes the movement of the Sagittarius Dwarf with respect to the Milky Way?
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A. It appears to be in a roughly polar orbit around the Milky Way.
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B. It appears to orbit the Milky Way at an angle of roughly forty-five degrees.
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C. It follows the movement of the stars in the Milky Way’s disk, though at a slightly faster rate.
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D. It once followed the movement of the stars in the Milky Way’s disk, but now seems to move erratically along its own path.