A short column of external diameter D and internal diameter d, is subjected to a load W, with an eccentricity 'e', causing zero stress at an extreme fibre. Then the value of 'e' must be

• A. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/51-324-1.png">
• B. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/51-324-2.png">
• C. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/51-324-3.png">
• D. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/51-324-4.png">