In the given reactions,identify the reagent $A$ and reagent $B$.
- A$A = CrO_3$,$B = CrO_3$
- B$A = CrO_3$,$B = CrO_2Cl_2$
- C$A = CrO_2Cl_2$,$B = CrO_2Cl_2$
- D$A = CrO_2Cl_2$,$B = CrO_3$
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