Purification and Characterisation of Organic Compounds: JEE Main 2026 Chemistry question

Method used for separation of mixture of products (B and C) obtained in the following reaction is: benzene $+\ \mathrm{Br_2}\xrightarrow{\mathrm{FeBr_3}}$ A $\xrightarrow[\text{Conc. }\mathrm{H_2SO_4}]{\text{Conc. }\mathrm{HNO_3}}$ B + C