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The correct sequence of these operations in tunnel construction is______________?
Consider the following operations :
1. Drilling
2. Blasting
3. Mucking
4. Placing steel
5. Placing concrete

A. 1,2,4,3,5

B. 1,3,2,4,5

C. 1,2,3,4,5

D. 1,3,4,2,5

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