c $1)$ Amino group of aniline is acetylated with acetic anhydride / pyridine.
$2)$ It is then brominated with bromine / acetic acid. As the $- NHCOCH _3$ is ortho/para directing group (since lone pair on $N$ activates the ring). Bromine enters in para position (para product is major).
$3)$ The final step is acid hydrolysis in which $- NHCOCH _3$ group is hydrolysed to $- NH _2$ group.
So, the product $C$ formed is $p-bromoaniline.$
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