For the Reaction 2X(g)+ Y(g) 2Z(g),Kc = 1

For the reaction 2X(g) + Y(g) 2Z(g) ,Kc = 1.00 ×10³ at 500 K.If at equilibrium the concentration of X is 0.20 M and the concentration of Y is 0.50 M,what is the equilibrium concentration of Z?

A) 2.2 M
B) 3.2 M
C) 3.5 M
D) 4.5 M
E) 7.1 M