The correct option is Presence of mineral deposits attracting industries..
Explanation
Population distribution and density are heavily influenced by economic factors, specifically the availability of natural resources. Mineral deposits act as a significant "pull factor," attracting labor and facilitating industrial development, which leads to the concentration of population in specific zones.
Detailed Analysis:
- Fertile loamy soils suitable for intensive agriculture. is incorrect: While fertile loamy soils drive population density in agrarian regions (such as river valleys), the Katanga-Zambia belt is not primarily known for intensive agriculture. Its density is not a result of soil fertility.
- Presence of mineral deposits attracting industries. is correct: The Katanga-Zambia belt is globally renowned for its vast copper deposits. The availability of minerals has attracted mining industries, infrastructure development, and a large workforce (both skilled and semi-skilled). This economic activity is the primary reason for the high population density in this region.
- Religious significance and cultural heritage. is incorrect: There is no specific religious or cultural heritage that serves as the primary demographic magnet for this region.
- Pleasant Mediterranean climate. is incorrect: The Mediterranean climate is found in the extreme northern and southern tips of Africa (e.g., Cape Town or the Maghreb region). The Katanga-Zambia belt lies in the tropical/subtropical zone of the continent.
Key Takeaway: The presence of mineral resources is a critical economic determinant of population density, capable of creating dense settlements in regions that might otherwise be sparsely populated.