Which of the following reactions is directly related to the corrosion of the Taj Mahal?

• A
  $2SO_{2(g)} + O_{2(g)} + 2H_2O_{(l)} \to 2H_2SO_{4(aq)}$
• B
  $NO_{(g)} + O_{3(g)} \to NO_{2(g)} + O_{2(g)}$
• C
  $CaCO_{3(s)} + H_2SO_{4(aq)} \to CaSO_{4(s)} + H_2O_{(l)} + CO_{2(g)}$
• D
  $4NO_{2(g)} + O_{2(g)} + 2H_2O_{(l)} \to 4HNO_{3(aq)}$