The correct options are
A Hydrogen is used in the oxyhydrogen torch.
B Hydrogen is used in rocket fuels.
C Hydrogen is used in Haber's process for the manufacturing of ammonia.
Hydrogen is used in Haber's process for the manufacturing of ammonia. It is also used in oxyhydrogen torches, where hydrogen and oxygen are taken in a ratio of 2:1 by mass.
Due to its high calorific value hydrogen is also used as rocket fuel.