Assertion (A) : Nitration of aniline can only be done by protecting `-NH_(2)` group through acetylation.
Reason (R) : Acetylation of aniline results in the increase of electron density at the benzene ring.
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not a correct explanation of A.
C. A is true but R is false.
D. A is false but R is false.