The correct option is D C6H5CH2NH2
Phenyl cyanide (benzonitrile) on reduction with sodium ethanol produces benzyl amine.
With the help of this reagent, −C≡N group is reduced to CH2−NH2 group.
Ph−C≡NNa(Hg)-ethanol −−−−−−−−−→Ph−CH2−NH2
Hence, the correct answer is option (a).