Which of the following was a member of the fluxus movement of artists, composers, and designers who popularized the zen philosophical practice of posing riddles as a way to lead students to enlightenment?

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.

answer; /// i believe that the correct answer is (d)the huang he river valley;