The graph which will be representing all the equilibrium concentrations for the reaction
$N _{2} O _{4}( g ) \rightleftharpoons 2 NO _{2}( g ) \text { will be : }$
(the concentrations of $N _{2} O _{4}( g )$ and of $NO _{2}( g )$ for which the following reaction will be at equilibrium will lie on which of the following graphs) —
