The reagent used in Hoffmann’s mustard oil reaction is

Question

$\begin {array} {1 1} (A)\;\text{Mustard oil and primary amine} & \quad (B)\;\text{$CS_2 $ and aniline in $HgCl_2$} \\ (C)\;\text{Nitrobenzene and $CS_2$} & \quad (D)\;\text{Sand RNC} \end {array}$