C talks of the South Pole being benign. D refers to the word benign in quotes. So, D should come after C, and quite possibly immediately after C. The idea conveyed here is that the South Pole has the most benign weather and it is benign from March to September. So we can directly eliminate choice (d). Sentence C makes a better choice for starting the paragraph than A. Sentence A talks of impeccable conditions for astronomy and B explains what it is. So the correct order of sentence arrangement is CDAB Correct Answer: CDAB
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