By 1900, the only two african nations that remained independent were
a. south africa and tanzania
b. rwanda and the democratic republic of the congo
c. liberia and ethiopia
d. libya and egypt

I think the correct answer would be Liberia and Ethiopia. During the 1900s, they are the countries who remained to be not in control of the Europeans. All African countries except these two were under in control already. Hope this answers the question.