The energy stored in a beam of length L subjected to a constant B.M. is

• A. <img src="/_files/images/civil-engineering/strength-of-materials/141-6.225-4.png">
• B. <img src="/_files/images/civil-engineering/strength-of-materials/141-6.225-3.png">
• C. <img src="/_files/images/civil-engineering/strength-of-materials/141-6.226-1.png">
• D. <img src="/_files/images/civil-engineering/strength-of-materials/141-6.226-2.png">