The correct option is B Ostwald's
Industrially, HNO3 is manufactured by Oswald's process. In this process, NH3 is converted to nitric acid. The reactions involved are as follows:
4NH3 + 5O2Pt−−→800°c 4NO + 6H2O2NO + O2 50°C−−→2NO23NO2 + H2O→2HNO3 + NO