The shape factor for a solid circular section of diameter D is equal to

• A. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/66-975-1.png">
• B. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/66-975-2.png">
• C. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/66-975-3.png">
• D. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/66-975-4.png">