Simple bending equation is

• A. <img src="/_files/images/civil-engineering/strength-of-materials/127-6.66-1.png">
• B. <img src="/_files/images/civil-engineering/strength-of-materials/127-6.66-2.png">
• C. <img src="/_files/images/civil-engineering/strength-of-materials/127-6.66-3.png">
• D. <img src="/_files/images/civil-engineering/strength-of-materials/127-6.66-4.png">
• E. none of these.