Two simply supported beams are made up of the same material and are of the same cross section. Both beams carry uniformly distributed loads of equal intensities. One beam is 2 m long and the other is 4 m long. The 2 m long beam shows a central deflection of 1 mm. What is the central deflection of the 4m long beam?

• A. 16 mm
• B. 2 mm
• C. 8 mm
• D. 1 mm