When a load W is applied suddenly on a bar of cross-sectional area A, the stress induced in the bar will be

• A. <img src="/_files/images/mechanical-engineering/machine-design/561-62-1.png">
• B. <img src="/_files/images/mechanical-engineering/machine-design/561-62-2.png">
• C. <img src="/_files/images/mechanical-engineering/machine-design/561-62-3.png">
• D. <img src="/_files/images/mechanical-engineering/machine-design/561-62-4.png">