Benzene on nitration gives nitrobenzene in presence of ${\mathrm{HNO}}_3$ and ${\mathrm{H}}_2{\mathrm{SO}}_4$ mixture, where:

• A

  both ${\mathrm{H}}_2{\mathrm{SO}}_4$ and ${\mathrm{HNO}}_3$ act as a bases
• B

  ${\mathrm{HNO}}_3$ acts as an acid and ${\mathrm{H}}_2{\mathrm{SO}}_4$ acts as a base
• C

  both ${\mathrm{H}}_2{\mathrm{SO}}_4$ and ${\mathrm{HNO}}_3$ act as an acids
• Correct answer
  D

  ${\mathrm{HNO}}_3$ acts as a base and ${\mathrm{H}}_2{\mathrm{SO}}_4$ acts as an acid

Hence, the correct answer is option: 'D'.