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Given the reaction between 2 gases represented by \( A_{2} \) and \( B_{2} \) to give the compound \( A B_{(g)} \).
\( \mathrm{P} \) \( A_{2(g)}+B_{2(g)} \rightleftharpoons 2 A B_{(g)} \)

W
At equilibrium, the concentration of \( A_{2}=3.0 \times 10^{-3} \mathrm{M} \), of \( B_{2}=4.2 \times 10^{-3} \mathrm{M} \), of \( A B=2.8 \times 10^{-3} \mathrm{M} \)
If the reaction takes place in a sealed vessel at \( 527^{\circ} \mathrm{C} \), then the value of \( K_{c} \) will be
(a) \( 2.0 \)
(b) \( 1.9 \)
(c) \( 0.62 \)
(d) \( 4.5 \)
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