Amino group, `-NH_(2)` is ortho, para-directing group in case of aromatic electrophilic substitution but nitration of aniline produce a good amount of m-nitroaniline. This is because

Options

A. in nitration mixture, ortho-para-activity of -`NH_(2)` group is completely lost
B. `-NH_(2)"becomes" -NH_(3)^(+),"which is m-directing"`
C. `-NH_(2)"becomes" -NH^(+)SO_(4)^(-),"which is m-directing"`
D. `-NH_(2)"becomes" -NH^(-)NO_(2)^(+),"which is m-directing"`

Answer

B