The width of a beam of uniform strength having a constant depth d length L, simply supported at the ends with a central load W is

• A. <img src="/_files/images/civil-engineering/strength-of-materials/141-6.229-1.png">
• B. <img src="/_files/images/civil-engineering/strength-of-materials/141-6.229-2.png">
• C. <img src="/_files/images/civil-engineering/strength-of-materials/141-6.229-3.png">
• D. <img src="/_files/images/civil-engineering/strength-of-materials/141-6.229-4.png">