Given the reaction between 2 gases represented by A2 and B₂ to give the (compound AB(g).
A₂(g) + B₂(g) → 2AB(g)
At equilibrium, the concentration of:
A₂ = 3.0 x 10-3 M
B₂ = 4.2 x 10-3 M
AB= 2.8 x 10-3 M
If the reaction takes place in a sealed vessel at 527 °C, then the value of Kc will be:

a. 2.0
b. 1.9
c. 0.62
d. 4.5