Which three styles are intertwined in Ligeti's Hungarian Rock?

Which of the following statements is not true?

A. Ragtime music is generally in duple meter and is performed at a moderate march tempo. B. Ragtime is a style of syncopated piano music that was popular from the 1890s to about 1915. C. King Oliver is generally acknowledged the "king of ragtime." D. When playing ragtime, the pianist's right hand plays a highly syncopated melody while the left hand maintains a steady beat.

What was a key group in the development of happening as art?

a)  The Gutai in Japan (Embodiment) b)  Dada in Switzerland c)  Neo-Dada in Europe d)  Assemblage artists in the United States