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Science and observation indicate that auroras, such as those seen in the Arctic and Antarctic, appears in various
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A. Antarctic, appears in various configurations that are shaped
B. Antarctic appears in various configurations in which those are shaped
C. Antarctic, appear in various configurations that are shaped
D. Antarctic appear in various configurations in which those are shaped
E. Antarctic, shaped in various configurations as those
C is preferrable to D since we need to use essential modifier that as we want to say that the configurations are shaped by the earth's magnetic field.
Therefore, correct answer is C.