Hydrogen Iodide Undergoes Decomposition According to the Equation

Hydrogen iodide undergoes decomposition according to the equation
2HI(g)
H₂(g) + I₂(g)
The equilibrium constant K_c at 425°C for this system is 0.018.If 1.0 mol each of H₂,I₂,and HI were placed together in a 1-L container at 425°C,then

A) because of reaction,the total number of molecules would increase.
B) the concentration of HI would decrease.
C) because of reaction,the total number of molecules would decrease.
D) the value of K would increase to 1.0.
E) the concentration of H₂ would decrease.