The chemical substance X is dissolved in water to become a solution. When the temperature of the solution increases, the chemical activity of X increases; when the X solution is mixed with the solution of the chemical substance Y, the temperature of the mixed solution is increased, and the chemical activity of Y is enhanced and the activity of X Invariant, when the Y solution is heated alone, the activity of Y remains unchanged. Can we know from this? ['Temperature change has no effect on X activity.', 'When X and Y are mixed, they show different activities than when they are studied alone.', 'Changes in temperature affect Y more than X.', 'When mixed with X, Y exhibits the same response as when studied alone.']