The longitudinal stress in a riveted cylindrical shell of diameter (d), thickness (t) and subjected to an internal pressure (p) is

• A. <img src="/_files/images/mechanical-engineering/strength-of-materials/118-378-1.png">
• B. <img src="/_files/images/mechanical-engineering/strength-of-materials/118-378-2.png">
• C. <img src="/_files/images/mechanical-engineering/strength-of-materials/118-378-3.png">
• D. <img src="/_files/images/mechanical-engineering/strength-of-materials/118-378-4.png">