The correct option is A Chemical process involving microorganisms is carried out
Bioreactor is defined as a vessel that carries out a chemical process involving microorganisms.
Bioreactor types range from small, benchtop units to 10,000-L systems for large-scale industrial applications, and can be batch type or continuous flow, in which materials flow constantly through the unit.
Tight control over parameters such as temperature, moisture, pH, oxygen, and stirring rate will produce the most satisfactory results—namely, maximized cell growth and productivity.