Two simply supported beams B1 and B2 have spans l and 2l respectively. Beam B1 has a cross-section of 1 x 1 units and beam B2 has a cross-section of 2 x 2 units. These beams are subjected to concentrated loads W each at the centre of their spans. The ratio of the maximum flexural stress in these beams is

• A. 4
• B. 2
• C. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/96-582-3.png">
• D. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/96-582-4.png">