I want the answer of 5.2

Q5.2 Consider the reaction 

        $$\begin{gathered} 3\mathrm{I}\left(\mathrm{aq}\right) +{\mathrm{S}}_2{\mathrm{O}}_8^2\left(\mathrm{aq}\right) \to {\mathrm{I}}_3^{-}\left(\mathrm{aq}\right) +2{\mathrm{SO}}_4^{2-}\left(\mathrm{aq}\right) \\ \mathrm{At} \mathrm{a} \mathrm{particular} \mathrm{time} \mathrm{t},\frac{\mathrm{d}\left[{\mathrm{SO}}_4^{2-}\right]}{\mathrm{dt}}=2.2\times {10}^{-2}\mathrm{M}/\mathrm{s}. \\ \mathrm{What} \mathrm{are} \mathrm{the} \mathrm{value} \mathrm{of} \left(\mathrm{a}\right) -\frac{\mathrm{d}\left[{\mathrm{I}}^{-}\right]}{\mathrm{dt}} \end{gathered}$$

   
      (b) $-\frac{\mathrm{d}\left[{\mathrm{S}}_2{\mathrm{O}}_8^{2-}\right]}{\mathrm{dt}}$                (c) $\frac{\mathrm{d}\left[{\mathrm{I}}_3^{-}\right]}{\mathrm{dt}}$ at the same time?
       (a) 3.3 × 10^–2 M/s                                  (b) 1.1 × 10^–2 M/s

       (c) 1.1 × 10^–2 M/s