Having the opportunity of working away from france as a pianist while still in his teens, debussy developed a lifelong interest in the music of question 8 options:

I believe the answer is: russia
During his teens, Claude debussy had the opportunity to work with wealthy patroness of Pyotr Ilyich Tchaikovsky in Russia.
At that place, he acquired the taste of  ancient and oriental modes and for vivid coloration that exist in russian music