Which of the following group of months is the coldest in North India?

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Accepted Answer

Step-by-step reasoning:

1. North India experiences its coldest period during the winter season, which falls in the months of December and January.
2. Around the December solstice the solar declination is about $-23.5^\circ$, giving the least solar insolation to the Northern Hemisphere and hence lowest temperatures.
3. Continentality (distance from the sea) and frequent western disturbances in North India also cause clear skies and cold waves, producing minimum temperatures in December–January.
4. The other listed pairs (Feb–Mar, Sep–Oct, Oct–Nov) correspond to late winter/early spring or autumn, which are milder compared to December–January.

FINAL_ANSWER: c

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