[" At constant temperture,the equilibrium constant (K,) for the decomposition reaction "],[N_(2)O_(4)~=2NO_(2)],[" is expressed by "K_(p)=(4x^(2)p)/(1-x^(2))," where "p=" total pressure at equilibrium,"x=" extent "],[" decomposition.Which one the following statements is true? "],[" A) "K_(p)" increases with increase of "p'.],[" C) "K_(p)" increases with decrease of "x" ."],[" D) "K_(p)" remains constant with change in "p'" and "x!]