Discussion
For thorough mixing of medium and inoculum the part of the fermentor useful is :
Answer: C
The mixing part is the impeller.
The impeller is the set of blades, usually Rushton turbines, mounted on the central shaft of a stirred-tank fermentor. As it turns, it mixes medium and inoculum thoroughly, keeps cells in suspension, breaks air bubbles into fine ones and spreads heat evenly.
The shaft only carries the impeller and transmits the motor's drive. The sparger releases air into the medium, and the headspace is the empty volume above the liquid.
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