In the reaction sequence $A$ $\xrightarrow{K_1} B$ $\xrightarrow{K_2} C$ $\xrightarrow{K_3} D$,where $K_3 > K_2 > K_1$,which step determines the rate of the reaction?
- A$A \rightarrow B$
- B$C \rightarrow D$
- C$B \rightarrow C$
- D$A \rightarrow D$
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