c
(a) Nitration reactions take place in presence of concentrated \(\mathrm{HNO}_{3}^{+}\) concentrated \(\mathrm{H}_{2} \mathrm{SO}_{4}\)

(b) Aniline acts as a base. In presence of \(\mathrm{H}_{2} \mathrm{SO}_{4}\), its protonation takes place and anilinium ion is formed

(c) Anilinium ion is a strongly deactivating group and meta directing in nature so it gives meta nitration product in a significant amount.