If p is the internal pressure in a thin cylinder of diameter d and thickness t, the developed hoop stress, is

• A. <img src="/_files/images/civil-engineering/strength-of-materials/135-6.163-1.png">
• B. <img src="/_files/images/civil-engineering/strength-of-materials/135-6.163-2.png">
• C. <img src="/_files/images/civil-engineering/strength-of-materials/135-6.163-3.png">
• D. <img src="/_files/images/civil-engineering/strength-of-materials/135-6.163-4.png">
• E. <img src="/_files/images/civil-engineering/strength-of-materials/135-6.163-5.png">