The thickness of web for unstiffened plate girder with clear distance d between the flanges shall not be less than

• A. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/56-355-1.png">
• B. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/56-355-2.png">
• C. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/56-355-3.png">
• D. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/56-355-4.png">