Consider the Following Reaction,equilibrium Concentrations,and Equilibrium Constant at a Particular $\quad$

Consider the following reaction,equilibrium concentrations,and equilibrium constant at a particular temperature.Determine the equilibrium concentration of NO₂(g) .
$\quad$ N₂O₄(g) ⇌ 2NO₂(g) K_c = 0.21 M
$\quad$ [N₂O₄]_eq = 0.039 mol L^-1

A) 1.22 mol L^-1
B) 9.0 × 10^-2 mol L^-1
C) 7.8 × 10^-2 mol L^-1
D) 8.2 × 10^-3 mol L^-1
E) 11 mol L^-1