A thin cylindrical shell of internal diameter 'D' and thickness 't' is subjected to internal pressure 'p'. The change in diameter is given by :

• A. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/18-702-1.png">
• B. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/18-702-2.png">
• C. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/18-702-3.png">
• D. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/18-702-4.png">