Answer:
(...) shifting the accent to a weak beat (also known as offbeat) instead of emphasizing the strong beat, this technique is cald syncopation
Explanation:
most commonly music emphasizes strong beats, I.E. the times you'd tap your feet on the ground when moving it along with the music. They are usually very regular, like a heartbeat or a metronome.
Syncopation is when you move the accent around so it falls before or after the strong beat (the tick in the metronome)
The answer is B) Sergei Diaghilev
Stravinsky rose to prominence when he was commissioned by the impresario Sergei Diaghilev to compose three ballets. The ballets were The Firebird, Petrushka, and Rite of Spring, all composed between 1910 and 1913.