The maximum slenderness ratio (KL/r) for a compression member as per IS 800 is:

Why is this the answer?

IS 800 Table 3: Max KL/r for compression member in main frame = 180; secondary/bracing = 200. Higher slenderness → more susceptible to buckling → lower design load. For tension members, IS 800 recommends max L/r = 400 (preferred). Slenderness limit prevents undue flexibility, vibration, and sag.

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