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In the first paragraph,the author most likely mentions the discovery of polar ice caps to suggest that:

A. Until recently Mars polar ice caps were thought to consist largely of carbon dioxide.
B. Martian polar ice caps are made almost entirely of water ice
C. Mars has many similarities to Earth, including the existence of polar ice cps.
D. Mars has only small fraction of the carbon dioxide found on Earth and Vnus.
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Explanation: Passage missing in source text.