1. Long winter nights |
2. Cloudless sky |
3. Relative humidity at sunset should be high |
4. There should be light wind of 2 to 5 km per hour |
A) 1, 2 and 3 are correct
B) 1, 2 and 4 are correct
C) 1, 3 and 4 are correct
D) 1, 2, 3 and 4 are correct
Correct Answer: D
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