In the following reaction and graph:$2H_2O_2(l)\rightarrow 2H_2O_2+O_2(g)$, he average rate of reaction is greatest in which time period?

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$\begin{array}{1 1}(a)\;0-2minute\\(b)\;0-4minute\\(c)\;0-6minute\\(d)\;0-8minute\end{array}$