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Which statement about Kc is wrong?
A. Kc is always a constant
B. For some reactions, Kc increases with temperature increase
C. For some reactions, Kc decreases with temperature decrease
D. For some reactions, Kc changes when pressure is changed

A is incorrect. Kc stays constant for concentration and pressure changes but not for temperature changes.

B and C are correct.

D is incorrect. It is true that a system at equilibrium may be made to shift one way or another (for some reactions) by changing the pressure, BUT, Kc will not change.

I note that the question asks which statement (not statements) are wrong.

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