The correct option is C Ethanal
Carbylamine reaction is used for test of identification of primary amines where primary amines by reaction with an alcoholic solution of potassium hydroxide and trichlormethane (or chloroform) forms foul smelling isocyanide.
RNH2 + CHCl3 + 3KOH→RNC + 3KCl + +3H2O
There is no use of ethanal in this reaction. Hence, (c) is the correct option.