The correct option is A Reimer - Tiemann reaction
Phenol with CCl4 and KOH gives salicylic acid. The reaction is known as Reimer - Tiemann reaction.
C6H5−OHCCl4,KOH−−−−−−−−−→o−HO−C6H4−CHO
The ortho isomer is the major product as it is stabilized by intramolecular hydrogen bonding.