If P is the direct load, L is the length of the member, A is the uniform area of cross-section and E is the Young's modulus; then strain energy due to direct stress caused by a gradually applied load is

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• B. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/02-1150-2.png">
• C. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/02-1150-3.png">
• D. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/02-1150-4.png">