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Dear student, In the given case, the equilibrium constant will be the same. The principle used in this case is that the equilibrium constant  is independent of the following factors: 1. Pressure 2. Volume 3. Concentration of reactants  4. Concentration of products 5. Catalyst. It means that though the above-mentioned factors are altered or changed, it will not have any effect on the equilibrium constant of the reaction. According to question, in this case reaction is reversible, if the concentration of reactants is doubled, the equilibrium constant will remain the same. Option (4) is correct. Regards,