To determine which section of the article highlights the idea that it could be dangerous for Europeans to explore Africa, we would need to consider the content typically associated with each section title:
(A) "Exploration" - This section might discuss the adventures and experiences of explorers in Africa, possibly touching on challenges but not specifically focusing on dangers.
(B) "Commerce" - This would likely deal with trade and economic interests, potentially addressing the benefits but not explicitly the dangers.
(C) "Quinine" - This section would likely discuss medical advancements, particularly related to malaria, which was a significant danger for Europeans in Africa, so this could relate to the dangers faced.
(D) "Politics" - This might cover geopolitical aspects and power struggles, which could involve risks but may not focus on the dangers of exploration itself.
Given this breakdown, the section that would likely highlight the dangers of exploring Africa would be (C) "Quinine," as it pertains to health risks associated with disease, which were a significant danger for Europeans during their exploration efforts.