Of the given sentences, B is the only one that makes a good start to the paragraph. Sentence A refers to 'that segment of ocean flow', C starts with 'it also', and D refers to 'this cycle'; so, these are unlikely to be the first sentence of the paragraph. Now, sentence B talks of the waters of the tropical Atlantic cruising along eastern US and going towards Europe. Clearly, sentence A, which makes a reference to 'that segment of ocean flow' is the one that follows B. Sentence B explains how the Gulf Stream, after the push northward, sinks and 'flows back southward'. Sentence D, which labels this cycle 'Atlantic Meridional Overturning Circulation' is the obvious one to follow B. Sentence D explains the effects of the Atlantic Meridional Overturning Circulation on the planet. Sentence C adds to this. So, BADC is the correct order. Correct Answer: BADC
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