Answer: A
Bromine must be introduced while the meta-directing nitro group is present: nitration gives nitrobenzene, BrX2/FeBrX3 gives 1-bromo-3-nitrobenzene, and Sn/HCl reduces the nitro group to give 3-bromoaniline. Brominating bromobenzene then nitrating gives ortho/para products, and brominating aniline gives ortho/para or tribromo products.