Answer:
Option (B)
Explanation:
Denitrification usually refers to the process by which the microbes present in the soil, takes up the nitrate and releases it into the atmosphere in the form of nitrogen gas, in absence of oxygen gas.
This process mostly takes place in the region where the soil is wet and warm, and there is an abundance of nitrate in the soil. This process is similar to the respiration process that is carried out by human beings, and this process cannot take place if there is no nitrate in the soil.
Thus, the correct answer is option (B).
