A drainage basin of 180 hectares comprises 40% wooded area, 45% grassed area and 15% paved area. Runoff coefficients for wooded, grassed and paved areas are 0.01, 0.2 and 0.95 respectively. The composite runoff coefficient for the drainage basin is ___________

• A. 2 to 25
• B. 2.5
• C. 0.02 to 0.025
• D. 0.20 to 0.25