What type of turbulence is characterized by slight, rapid, and rhythmic bumpiness without significant changes?

The correct answer describes a type of turbulence that is light in nature, specifically characterized by its slight, rapid, and rhythmic bumpiness. This type of turbulence is typically experienced as minor disturbances that for the most part do not create significant discomfort or disruptions for passengers and crew.

When discussing turbulence categories, distinctions are made based on the intensity and effects felt during flight. Occasional light chop aligns perfectly with the definition provided in the question since it highlights the mild and sporadic nature of this turbulence. It emphasizes that while the bumps occur, they are not severe enough to cause any substantial changes to the flight's normal operation.

In contrast, other types of turbulence such as moderate or severe chop involve a greater degree of bumpiness and discomfort, which would not fit the description given in the question. Moderate turbulence, for instance, is characterized by more significant alterations in altitude and attitude, while severe chop would involve large, abrupt movements that can strain the aircraft structure and impact passenger stability considerably. Thus, the choice of occasional light chop is appropriate and captures the essence of the turbulence type being described.