Which primary arylamine is obtained by replacing exactly one hydrogen of benzene with an NH₂ group, with no other substitution?

Explanation

Replacing exactly one hydrogen of benzene with NH₂, with no other substitution, gives aniline, C₆H₅NH₂. Toluidines also contain a methyl substituent. Pyridine and quinoline have nitrogen within a ring and are not the primary arylamine specified by this structure.