The chemical reaction $2O_3 \to 3O_2$ proceeds as follows : $O_3 \rightleftharpoons O_2+O ......(fast) \qquad O+O_3 \to 2O_2 ....(slow)$. The rate law expression should be :

Question

$(A)\;r=K [O_3]^2 \\ (B)\;H=K [O_3]^2[O_2]^{-1} \\(C)\;r= K [O_3][O_2] \\(D)\;unpredictable$