Which of the following is the correct order of stages of estimation of concrete roads?

• A. earthwork excavations, cement concrete for the base course (1:4:8) and cement concrete for wearing course (1:2:8)
• B. earthwork excavations, cement concrete for wearing course (1:4:8) and cement concrete for the base course (1:2:8)
• C. earthwork excavations, cement concrete for the base course (1:6:9) and cement concrete for wearing course (1:7:9)
• D. cement concrete for the base course (1:2:3), cement concrete for wearing course (2:7:9) and earthwork excavations