Given the reaction between $2$ gases represented by ${\text{A}}_2$ and ${\text{B}}_2$ to give the compound ${\text{AB}}_{(\text{g})}$. At equilibrium, the concentration of:$[{\text{A}}_2]=3.0\times 10^{-3}\text{M}$$[{\text{B}}_2]=4.2\times 10^{-3}\text{M}$$[\text{AB}]=2.8\times 10^{-3}\text{M}$ If the reaction takes place in a sealed vessel at $527^{\circ }\text{C}$, then the value of $K_c$ for the reaction ${\text{A}}_2+{\text{B}}_2\rightleftharpoons 2\text{AB}$ will be:

1. A
   $4.5$
2. B
   $2.0$
3. C
   $1.9$
4. D
   $0.62$