A simply supported beam of span 'L' carries a concentrated load 'W' at mid-span. If the width 'b' of the beam is constant and its depth is varying throughout the span, then what should be its mid-span depth, when design stress is 'f' ?

• A. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/65-399-1.png">
• B. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/65-399-2.png">
• C. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/65-399-3.png">
• D. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/65-399-4.png">