$(B)$ $SH^{\ominus}$ is best $Nu^{\ominus}$ than $MeSH$
$(C)$ $Cl^{\ominus}$ is best $Nu^{\ominus}$ than $I^{\ominus}$ in $DMSO$
$(D)$ In polar protic solvent $I^{\ominus}$ is better $Nu^{\ominus}$ than $Cl^{\ominus}$
$I.$ $DDT$ $II.$ Gammerane
$III.$ Carbon tetrachloride $IV.$ Chlorobenzene