Final answer:
A tornado is a small and very intense example of a cyclone, formed from rotating air within a supercell thunderstorm.
Step-by-step explanation:
A tornado is a small, very intense example of a cyclone. Tornadoes form from severe thunderstorms known as supercells, where there is a rotating column of air that can become a tornado when the radius of rotation narrows, causing an increase in angular velocity due to conservation of angular momentum.
This is different from large-scale rotation effects like the Coriolis force, which influences the rotation direction of tropical cyclones and is a result of Earth's rotation, causing a counterclockwise rotation in the northern hemisphere and clockwise rotation in the southern hemisphere. The correct option that defines a tornado in this context is therefore 'e. cyclone.'