The correct option is D C6H5NC
Carbylamine reaction is used for test of primary amines. In this reaction primary amines react with an alcoholic solution of potassium hydroxide and trichlormethane (or chloroform) to forms foul smelling isocyanide.
C6H5NH2+3KOH+CHCl3→C6H5NC+3KCl+3H2O
Hence, (d) is the correct option.