`-NH_(2)` group is a strong activator towards aromatic electrophilic substiution reaction. Activating capability of `-NH_(2)` group can be reduced by treating with
A. `CH_(3)I`
B. `CH_(3)overset(O)overset(|)C-Cl`
C. `CH_(3)-NH_(2)`
D. `CH_(3)-overset(O)overset(||)C-O-overset(O)overset(||)C-CH_(3)`