The bromination of acetone that occurs in acid solution is represented by the equation ${\text{CH}}_3{\text{COCH}}_3+{\text{Br}}_2\stackrel{{\text{H}}^{+}}{\to }{\text{CH}}_3{\text{COCH}}_2\text{Br}+{\text{H}}^{+}+{\text{Br}}^{-}$. Based on kinetic data showing the rate is independent of $[{\text{Br}}_2]$, what is the rate equation?

1. A
   $\text{Rate}=k[{\text{CH}}_3{\text{COCH}}_3][{\text{Br}}_2][{\text{H}}^{+}]$
2. B
   $\text{Rate}=k[{\text{CH}}_3{\text{COCH}}_3][{\text{H}}^{+}]$
3. C
   $\text{Rate}=k[{\text{CH}}_3{\text{COCH}}_3][{\text{Br}}_2]$
4. D
   $\text{Rate}=k[{\text{CH}}_3{\text{COCH}}_3][{\text{Br}}_2][{\text{H}}^{+}{]}^2$