An equilibrium system for the reaction between hydrogen and iodine to give hydrogen iodide at 765 K in a 5 litre volume contains 0.4 mole of hydrogen, 0.4 mole of iodine and 2.4 moles of hydrogen iodide, The equilibrium constant for the reaction is :
`H_2+I_2 hArr 2HI`, is :
A. `36.0`
B. `15.0`
C. `0.067`
D. `0.28`