Identify the reagent used in the following conversion.
- A$CO, HCl / AlCl_3$
- B$CrO_2 Cl_2 \cdot H_3 O^{+}$
- C$AlH(i-Bu)_2, H_3 O^{+}$
- D$CrO_3, (CH_3 CO)_2 O$
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