A: Nitration of aniline can only be done by protecting `-NH_2` group through acetylation. R: Acetylation of aniline results in the increase of electron density on the benzene ring.
A. A and R are true and R is the correct explanation of A
B. A and R are true and R is not the correct explanation of A
C. A is true R is false
D. A is false R is true