Concept:Colonial extractive investments were located only in resource-rich areas, so the different regions of Nigeria developed at unequal rates.
Explanation:The colonial economy depended on extracting raw materials such as tin, coal, cocoa, and palm products from Nigeria.
These extractive industries were established only where such resources were available, for example, tin on the Jos Plateau and coal at Enugu.
The colonial government then built railways, roads, and port facilities to serve those specific places.
Labour and traders were attracted to these centres, which boosted their economic growth further.
In contrast, regions without valuable raw materials received very little colonial investment or infrastructure.
This pattern of concentration created a widening gap between the more developed and the neglected zones.
Hence, the colonial investment in extractive industries ultimately produced unequal growth among the Nigerian regions.
Answer:D: uneven development of the regions in Nigeria.