A group which deactivates the benzene ring towards electrophilic substitution but directs the incoming group towards o - and p-positions is 

 Deactivating groups are those that take electrons but make replacement difficult. The position of the approaching group is also determined by the group or substitute that is already on the ring. The following are the ortho and para directing groups: $-{\mathrm{CH}}_3,{\mathrm{C}}_2{\mathrm{H}}_5(-\mathrm{R}),-{\mathrm{NH}}_2,-\mathrm{OH}\text{, halogens, (Cl , Br , I) }$

Hence the correct option is (B). $-\mathrm{Cl}$