Which of the following dances is known for its rocking hip motion and fast-fast-slow sequence?

The dance known for its rocking hip motion and fast-fast-slow sequence is the rumba. This style of dance emphasizes rhythm, sensual movements, and body isolations, particularly in the hips, which create the signature sway characteristic of the rumba. The fast-fast-slow sequence refers to the timing and phrasing of the dance, where the rhythm involves quick steps (two quick counts) followed by a slower count, allowing for expressive movements that highlight the dancer's technique and musicality.

In contrast, while reggae incorporates hip movements, it is primarily associated with the culture and music of Jamaica rather than a structured dance format like the rumba. The cha cha is notable for its syncopated rhythm and the "cha cha" step, which doesn't emphasize the same rocking motion as the rumba. The paso doble is a dramatic, theatrical dance that is characterized by its strong, march-like tempo and does not follow the same rhythmic pattern found in the rumba. Thus, the rumba distinctly stands out for its recognizable style and timing.