If flexural rigidity of a column whose length is L and the loaded end is free, is El, the critical load will be

• A. <img src="/_files/images/civil-engineering/steel-structure-design/95-14-48-1.png">
• B. <img src="/_files/images/civil-engineering/steel-structure-design/95-14-48-2.png">
• C. <img src="/_files/images/civil-engineering/steel-structure-design/95-14-48-3.png">
• D. <img src="/_files/images/civil-engineering/steel-structure-design/95-14-48-4.png">
• E. <img src="/_files/images/civil-engineering/steel-structure-design/95-14-48-5.png">