Nitro benzene can be prepared from benzene by using a mixture of Conc $H_2SO_4$ and CONC $HNO_3$.In te mixture Nitric acid acts as

Question

$\begin {array} {1 1} (A)\;Reducing \: agent & \quad (B)\;acid \\ (C)\;base & \quad (D)\;catalyst \end {array}$