Concept:The North-Central Highlands of Nigeria are the region that covers about one-fifth of the country and consists of a flat surface interrupted by granitic hills.
Explanation:The North-Central Highlands occupy a large part of central Nigeria.
They cover roughly one-fifth (
51 or 20%) of the total land area of the country.
The region is underlain mainly by ancient basement complex rocks, especially granite.
Over time, erosion produced a generally flat surface dotted with isolated granitic hills and inselbergs.
This description does not fit the North-Eastern highlands, the Cross River basin, or the Western highlands.
The Cross River basin is a low-lying river basin, not a highland region with granitic hills.
Therefore, the correct geographical region is the North-Central highlands.
Answer:D. North-Central highlands