Final answer:
The Age of Exploration and maritime trade most strongly contributed to the mapmakers' depiction of West Africa and the southern half of the world on the map.
Step-by-step explanation:
The historical development that most strongly contributed to the mapmakers' depiction of West Africa and the southern half of the world in the map is option b) The Age of Exploration and maritime trade.
During the Age of Exploration, European explorers, such as the Portuguese and Spanish, ventured into unknown territories and discovered new lands, including parts of West Africa and the southern hemisphere. These explorations led to increased knowledge and understanding of these regions, which influenced how mapmakers depicted them on maps.
For example, the maps of the time started to show more accurate representations of the coastlines and geographical features of West Africa and the southern half of the world due to the explorations and trade routes established during the Age of Exploration.