South Africa's Economy and Population Are Smaller Than That of Nigeria.Why

Multiple Choice

South Africa's economy and population are smaller than that of Nigeria.Why then, is it included as one of the BRICS?

A) It has a powerful military able to project power regionally.
B) It has a close economic relationship with China, which has huge financial interests in the country in fields such as mining, banking and infrastructure projects.
C) It is heavily involved in the peacekeeping operations in Africa.
D) It is a nuclear weapon state.