Which of the following is a Friedel-Crafts reaction?
- A$C_6H_6 + FeCl_3 + Cl_2 \to C_6H_5Cl$
- B$C_6H_5CHO + CH_3CHO + KOH \to C_6H_5CH = CH - CHO$
- C$C_6H_6 + CH_3COCl + AlCl_3 \to C_6H_5 - CO - CH_3$
- D$C_6H_5OH + CHCl_3 + KOH \to \text{Salicylaldehyde}$
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