Which of the following is the strongest base?

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(D) To determine the basic strength,we look at the availability of the lone pair on the nitrogen atom.$C_6H_5NH_2$ (Aniline) has the lone pair in reso

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$C_6H_5CH_2NH_2$

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(D) To determine the basic strength,we look at the availability of the lone pair on the nitrogen atom.$C_6H_5NH_2$ (Aniline) has the lone pair in resonance with the benzene ring,reducing its availability.$p-O_2NC_6H_4NH_2$ and $m-O_2NC_6H_4NH_2$ contain the $-NO_2$ group,which is a strong electron-withdrawing group ($-I$ and $-M$ effects),further decreasing the basicity.$C_6H_5CH_2NH_2$ (Benzylamine) has the $-NH_2$ group attached to a $CH_2$ group,not directly to the benzene ring.Therefore,the lone pair on nitrogen is not involved in resonance with the benzene ring,making it the most available for protonation.Thus,$C_6H_5CH_2NH_2$ is the strongest base among the given options.

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