A compound X is formed when acetaldehyde condenses with ethyl amine.X on further catalytic hydrogenation $(H_2/Ni)$ will yield

Question

$\begin{array}{1 1}(a)\;\text{Ethyl methyl amine}&(b)\;\text{n-Butyl amine}\\(c)\;\text{Diethyl amine}&(d)\;\text{Trimethyl amine}\end{array}$