At constant temperature, the equilibrium constant `(K_(p))` for the decomposition reaction
`N_(2)O_(4) hArr 2NO_(2)`
is expressed by `K_(p)=4x^(2)p//(1-x^(2))`, where p=pressure x= extent of decomposition. Which of the following statements is true?
A. `K_(p)` increases with increase of P
B. `K_(p)` increases wih increase of x
C. `K_(p)` increases with decrease of x
D. `K_(p)` remains constant with change in P or x.