Select the sentence with correct subject-verb agreement.
a. the choir, which have performed all over the world, is preparing for the detroit concert next week.
b. the choir, which has performed all over the world, is preparing for the detroit concert next week.
c. the choir, which have performed all over the world, are preparing for the detroit concert next week.

The answer is B: The choir, which has performed all over the world, is preparing for the Detroit concert next week.

Explanation: i hope this help i'm sorry if its wrong :)

the african society basically suffered the consequences of colonization and apartheid directly attacking the black people, first, during the colonialism and its main idea which which "white people" had better rights, affecting   them principally in the right to establish black people in their territories, access to quality education and health services and took away any civil right even to the black people to feel they have the same opportunities as the settlers.