The equilibrium constant for the reaction H2(g) + I₂(g) 2HI(g) is 32 at a given temperature.

The equilibrium concentration of I₂ and HI are 0.5 × 10⁻³M and 8 × 10⁻³M respectively. The equilibrium concentration of H₂ is:

A. 1 × 10⁻³ M
B. 0.5 × 10⁻³ M
C. 2 ×10⁻³ M
D. 4 ×10⁻³ M