Total elongation of a prismatic bar of length L, weight W, cross-sectional area A and modulus of elasticity E, under its own weight, while hanging vertically, is

• A. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/91-1100-1.png">
• B. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/91-1100-2.png">
• C. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/91-1100-3.png">
• D. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/91-1100-4.png">