The answer would be a. hope this helps
Yoko Ono belongs to this movement of artist, composers, and designers that really popularized the Zen philosophical practice of posing riddles, they were known as Koans, and to lead the students to the enlightenment and the movement was called Fluxus.
Correct me if I'm wrong but I think the answer is:
"They were white musicians and composers who were heavily influenced by jazz."
Hope this helps and God bless you!