The correct option is C 5 kg
The orientation will be tilted towards the heavier side.
So the required weight should be such that the total weight on the 2 kg side should be more than 6 kg.
If we put 5 kg with 2 kg
Total weight = 5 + 2 = 7 kg
7 kg > 6 kg
So, orientation will change and it will be tilted toward the 2 kg weight.