The correct answers are. The first blank, A) King Leopold II. The second blank, B) Henry Stanley.
King Leopold II started an expedition with the goal of colonizing Congo. He hired Henry Stanley to explore and establish colonies in Congo. Soon several other European nations started establishing colonies in Africa as well.
Henry Morton Stanley (1841-1904) was an English explorer that traveled to many places in Central Africa. King Leopold II of Belgium patronaged the expeditions and Stanley went as far as the Nile in Egypt and Congo, where he took many treasures and natural resources. He also was a journalist and participated in an expedition throughout the Ottoman Empire.
The other options of the question were, first blank: B) Henry Stanley. C) Otto von Bismarck. The second blank: A) King Leopold II. C) Otto von Bismarck.