________ Thai ethnic group lives mainly in Vietnam’s northern and north-central regions in Lai Chau, Dien Bien, Son La, Yen Bai, Hoa Binh, Nghe An, and Thanh Hoa province

________ Thai ethnic group lives mainly in Vietnam’s northern and north-central regions in Lai Chau, Dien Bien, Son La, Yen Bai, Hoa Binh, Nghe An, and Thanh Hoa province.
A: a
B: an
C: the
D: Ø