Which of the following reactions will produce $R-CO-Ar$?
- A$ArCOCl + H-Ar \xrightarrow{AlCl_3}$
- B$COCl + RMgX \rightarrow$
- C$R + CrO_3 \rightarrow$
- D$RCOCl + H-Ar \xrightarrow{AlCl_3}$
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