Sentence A explains how sea ice serves as a “blanket” on top of the ocean, protecting the water from solar heat. We see that sentence D too refers to this idea, talking of how the melting of this “frozen coating” leads to warming of the oceans. Sentence B concludes the paragraph, saying that this leads to the melting of land ice and driving up of sea levels. So, ADB forms a cogent paragraph. Option C, which talks of the melting sea ice not adding to the ocean’s mass is the one to be eliminated, as it discusses a completely unrelated idea. Correct Answer: Choice (c)
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