The Boers. Both the Zulus and Bantus are africa tribes.
it is B: exclusion from office of ex-Confederate officers who had served during the Civil War
Countries trade with each other when, on their own, they do not have the resources, or capacity to satisfy their own needs and wants. By developing and exploiting their domestic scarce resources, countries can produce a surplus, and trade this for the resources they need. You can integrate all of this into your question. Hope this helped.