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

• A. 1, 2, 4, 3, 5
• B. 1, 3, 2, 4, 5
• C. 1, 2, 3, 4, 5
• D. 1, 3, 4, 2, 5