The total strain energy of a beam of length L, having moment of inertia of its section I, when subjected to a bending moment M, is

• A. <img src="/_files/images/civil-engineering/theory-of-structures/87-21-79-1.png">
• B. <img src="/_files/images/civil-engineering/theory-of-structures/87-21-79-2.png">
• C. <img src="/_files/images/civil-engineering/theory-of-structures/87-21-79-3.png">
• D. <img src="/_files/images/civil-engineering/theory-of-structures/87-21-79-4.png">