Given the reaction at equilibrium: \(2 \mathrm{CO}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{~g}) \leftrightarrow 2 \mathrm{CO}_{2}(\mathrm{~g})\) When the reaction is subjected to \(C\) stress, a change will occur in the concentration of ____________

A. reactants, only
B. products, only
C. both reactants and products  
D. neither reactants nor products

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Correct Answer: C