According to this map of Colonial Africa in 1914, the European nations that would lose the largest territorial area in Africa if African nations were given their independence would be

AFrance and Spain.
BGermany and France.
CGreat Britain and France.

Eliminate

DBelgium and Great Britain

According to this map of Colonial Africa in 1914, the European nations that would lose the largest territorial area in Africa if African nations were given thei class=