The length of a column, having a uniform circular cross-section of 7.5 cm diameter and whose ends are hinged, is 5 m. If the value of E for the material is 2100 kN/cm2, the permissible maximum crippling load will be

• A. 1.288 kN
• B. 12.88 kN
• C. 128.8 kN
• D. 288.0 kN