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(A) The reactivity towards electrophilic aromatic substitution depends on the electron density of the benzene ring.$1$. The $-NH_2$ group in aniline $

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$I > II > III$

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(A) The reactivity towards electrophilic aromatic substitution depends on the electron density of the benzene ring.$1$. The $-NH_2$ group in aniline $(I)$ is a strong electron-donating group due to its $+M$ effect,which significantly increases the electron density on the ring,making it highly reactive.$2$. Benzene $(II)$ has no substituents,serving as the reference point.$3$. The $-NO_2$ group in nitrobenzene $(III)$ is a strong electron-withdrawing group due to its $-M$ and $-I$ effects,which significantly decreases the electron density on the ring,making it the least reactive.Therefore,the correct order of reactivity is $I > II > III$.

The correct order of reactivity towards the electrophilic substitution of the compounds aniline $(I)$,benzene $(II)$,and nitrobenzene $(III)$ is

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