Replacement of `CI` of chlorobenzene to give pheno1 require drastic conditions but chlorine of `2 4-dinitrochlorobenzene is readily replaced because .
A. `-NO_(2)` withdraws electrons from o-and p-positions
B. `-NO_(2)` withdraws electrons from m-position
C. `-NO_(2)` donates electrons at m-position
D. `-NO_(2)` makes the ring electron rich at o-and p-positions
