An R.C.C. column is treated as long if its slenderness ratio is greater than which of the following? A. 30 B. 35 C. 40 D. 50 E. 60

If your Slenderness Ratio  is more than 12 then it's a long column or if it's less than 12 then it's called short column.

Long Column ( I / b ) > 12  or I/r  > 40

I = effective length / r = Radius of gyration / b= Least dimension

I/r is slenderness ration and it should be =<40  / this is for Steel ! Remember !

         THIS IS FOR YOUR INFORMATION ,

• Short RCC Column =<12
• Long RCC Column >12
• Short Steel column, =<50
• Intermediate Steel Column >40 & <200
• Long Steel Column >200

option D-50  is the correct answer

the amount of slenderness option D=50 

c. 40

(Answer should contain a minimum of 25 characters.)?

the slenderness ratio for RCC columns answer is (c. 40)

IS Code agree with Hassan Mayahi. 

I think the correct answer is D = 50

 thanks for invition my choice is option D