At Some Temperature,a 4

At some temperature,a 4.0 L flask is found to contain 10.0 mol of CO₂,8.0 mol of C,and 10.0 mol of CO,at equilibrium.What is the value of the equilibrium constant,K_c,for this reaction?

A) 1.25
B) 0.50
C) 0.40
D) 2.50