Answer: a. move.
Step-by-step explanation:
Cholera is a kind of bacteria that uses bacterial flagellar motor composed by stator and rotor and flagellum (plural, flagella) to move. It is located in the plasma membrane and the movement generated is the rotation of flagellum attached to the rotor, driven by the flow of protons from outside to inside the cell. Flagella are long polymers because they are constituted essentially of thousand of identical protein sub units.