Concept:Population distribution in West Africa is shaped mainly by physical conditions and economic opportunities.
Explanation:Areas with favourable physical features such as good relief, fertile soil, and moderate climate attract more people.
Regions with strong economic prosperity, such as urban centres and commercial farming zones, also draw large populations.
In contrast, harsh environments like deserts and areas with limited economic activities remain sparsely populated.
Thus, the combined effect of favourable physical conditions and economic prosperity best explains the population pattern in West Africa.
Answer:B. Economic prosperity and favourable physical conditions.