The reaction of toluene with chlorine in presence of ferric chloride gives predominantly:

The reaction of toluene with chlorine in presence of ferric chloride gives predominantly:  o- and p-cltlorotoluene.

Electrophilic substitution of the benzene ring by the ${\mathrm{Cl}}^{+}$ ion at the ortho and para positions happens in the presence of ${\mathrm{FeCl}}_3$ and in the dark to produce o- and p-chlorotoluene.

The electrophilic substitution mainly takes place at ortho and para position because the methyl group stimulates the ring at these places more than at meta position.

Again, the para isomer is the main product among them for steric reasons.

Hence, option D is correct.