The correct option is D I>II>III
The correct order of reactivity towards the electrophilic substitution of the compounds aniline (I) Benzene (II) Nitrobenzene (III) is I>II>III $. In aniline, the amino group increases the electron density on the benzene ring and increases the reactivity towards electrophilic aromatic substitution reaction. In nitrobenzene, the electron withdrawing nitro group decreases the electron density of benzene ring and deactivates the ring towards electrophilic aromatic substitution reaction.