| [ A ]    by cyanobacteria | |
| [ B ] by electrical discharges | |
| [ C ] by Industrially synthesized Fertilizer | |
| [ D ] by denitrification |  | 
| [ A ]    by cyanobacteria | |
| [ B ] by electrical discharges | |
| [ C ] by Industrially synthesized Fertilizer | |
| [ D ] by denitrification |  | 
| Answer : Option D | 
| Explanation : | 
| Denitrification is a microbially facilitated process of nitrate reduction that may ultimately produce molecular nitrogen (N2) through a series of intermediate gaseous nitrogen oxide products. | 
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