Answer:
Option: C. Their explorations contributed to the potential desirability of parts of Africa for economic purposes.
Explanation:
Increasing hostility between several European countries with the rise of Imperialism brought the rush to invasion, colonization and annexation of African territory. During those ages, many famous explorers tried to explore central portions of the continent. Explorers like Richard Francis Burton, David Livingstone, John Hanning Speke, Henry Morton Stanley in Africa helped Europeans to establish their colonies in the wilderness to get access to the natural resource and rich minerals to prospers their nations.