Which of the following describes extreme turbulence?

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Extreme turbulence means the air is acting so violently that the airplane is tossed about in an irregular, severe way, making it nearly impossible for the crew to maintain normal control. This level of disturbance causes large, abrupt changes in attitude and altitude and can stress the aircraft more than in lighter conditions. It’s rare and usually associated with strong convective activity, jet streams, or other highly unstable air; pilots will work to avoid it by changing altitude or course and by securing everyone with seat belts. The other descriptions describe lighter levels of disturbance: light is a small, brief fluctuation; mild is a less intense, easily managed disturbance; moderate involves more noticeable changes but remains controllable. Only the extreme description fits the scenario of being violently tossed about and practically uncontrollable.