Which of the following ethnic groups have suffered a long history of discrimination in Japan?

A. Ainu

B. Uygurs

C. Xinjiang

D. Falun Gong

B. The Uygurs: they don't live in Japan but in many countries in Asia.

C. - this is the name of a province in China

D. - this is a name of a practice in China

The correct answer is A. Ainu. Ainu are a people in Japan, speaking Ainu languages, who are a minority