Consider the reaction:${\text{Cl}}_2(aq)+{\text{H}}_2\text{S}(aq)\to \text{S}(s)+2{\text{H}}^{+}(aq)+2{\text{Cl}}^{-}(aq)$ The rate equation for this reaction is $\text{rate}=k[{\text{Cl}}_2][{\text{H}}_2\text{S}]$.Which of these mechanisms is/are consistent with this rate equation?(A) ${\text{Cl}}_2+{\text{H}}_2\text{S}\to {\text{H}}^{+}+{\text{Cl}}^{-}+{\text{Cl}}^{+}+{\text{HS}}^{-}$ (slow)${\text{Cl}}^{+}+{\text{HS}}^{-}\to {\text{H}}^{+}+{\text{Cl}}^{-}+\text{S}$ (fast)(B) ${\text{H}}_2\text{S}\rightleftharpoons {\text{H}}^{+}+{\text{HS}}^{-}$ (fast equilibrium)${\text{Cl}}_2+{\text{HS}}^{-}\to 2{\text{Cl}}^{-}+{\text{H}}^{+}+\text{S}$ (slow)

1. A
   B only
2. B
   Both A and B
3. C
   Neither A nor B
4. D
   A only