The correct option is A C6H5CH2OH
Lithium aluminium hydride (LiAlH4) is an stronger reducing agent that can reduce aldehydes, ketones, carboxylic acids and esters.
LiAlH4 reduces −COOH group to−CH2OH group.C6H5COOHLiAlH4−−−−→C6H5CH2OH
Hence option (a) is correct.