What is the correct sequence of these areas in descending order of their coal reserves?
1. Himalayas
2. Chhotta Nagpur
3. Chhattisgarh
4. Son Valley
A. 1, 4, 3, 2
B. 2, 4, 3, 1
C. 1, 3, 4, 2
D. 2, 3, 4, 1
Answer: Option D
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