A timber beam of 150 mm width and 200 mm depth is flitched with two steel plates of 10 mm thickness and 150 mm width at top and bottom. The Young’s moduli of steel is 210 GPa and of timber is 14 GPa. Then the equivalent width of the timber segment is

• A. 15 mm
• B. 10 mm
• C. 20 mm
• D. 110 mm