The chief source for the production of nitrogeneous fertilizers is :

Answer: Option A

Nitrogen fertilizers are often made using the HaberBosch process which uses natural gas (CH₄⁺) for the hydrogen and nitrogen gas from the air at an elevated temperature and pressure in the presence of a catalyst to form ammonia as the end product. This ammonia is used as a feedstock for other nitrogen fertilizers, such as anhydrous ammonium nitrate and urea.