Pick out the wrong statement pertaining to nitric acid ?

• A. About 90% of nitric acid is manufactured by Ostwald’s process
• B. It is a strong mono basic acid which reacts with almost all the metals except noble metals
• C. Yellow color of impure nitric acid is because of dissolved oxides of nitrogen (mainly NO2)
• D. Arc process of nitric acid manufacture is economical as compared to Ostwald’s process