Music appreciation the early twentieth ók was interested in developing                a.  close friendships with italian composers.      b.  an atonal system.      c.  a hungarian national style.      d.  a new style of opera.

The best answer is C) A Hungarian national style

Bartok was interested in including a Hungarian national identity in his music, and establishing a distinctly Hungarian style. Toward this effort, he traveled the Hungarian countryside in the early 1900s to explore folk music and other aspects of the Hungarian musical tradition. 

The term is called adduction 

Dobrý den, nevím přesně, ale možná je to pop a další