For stairs spanning l metres longitudinally between supports at the bottom and top of a flight carrying a load w per unit horizontal area, the maximum bending moment per metre width, is

• A. <img src="/_files/images/civil-engineering/rcc-structures-design/85-13-191-1.png">
• B. <img src="/_files/images/civil-engineering/rcc-structures-design/85-13-191-2.png">
• C. <img src="/_files/images/civil-engineering/rcc-structures-design/85-13-191-3.png">
• D. <img src="/_files/images/civil-engineering/rcc-structures-design/85-13-191-4.png">
• E. <img src="/_files/images/civil-engineering/rcc-structures-design/85-13-191-5.png">