Under What Conditions Are the Values of K_c and K_p

Under what conditions are the values of K_c and K_p for a given gas-phase equilibrium the same?

A) if there is no change in the moles of gas in the reaction
B) if there is no change in the temperature during the reaction
C) if the coefficients of the reactants and products are the same
D) if the pressure remains constant
E) if either K_c or K_p = 1