Industrial Nitrogen Fixation Is Achieved Through the Haber Process

Industrial nitrogen fixation is achieved through the Haber process

A) in which N₂ is reduced catalytically by H₂ at ambient temperature.
B) in which N₂ is hydrogenated by CH₄ at extreme temperature and pressure.
C) in which nitrate and nitrite are chemically converted to NH at ambient temperature.
D) which requires little energy.
E) which is carried out by purified enzymes in a reactor.