The nitro group in nitrobenzene is a

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(B) . The $-NO_2$ group is a strong electron-withdrawing group due to its $-I$ and $-M$ effects. It decreases the electron density at the $o-$ (ortho)

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(B) . The $-NO_2$ group is a strong electron-withdrawing group due to its $-I$ and $-M$ effects. It decreases the electron density at the $o-$ (ortho) and $p-$ (para) positions of the benzene ring. As a result,the incoming electrophile is directed to the $m-$ (meta) position,where the electron density is relatively higher compared to the $o-$ and $p-$ positions. Therefore,it is a $m-$directing group.

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