The correct answer is: a) Midlands.
Laterite is a type of soil that is rich in iron and aluminum oxides. It is formed when tropical soils are exposed to intense weathering and leaching. Laterite is a hard, reddish-brown soil that is often used as a building material. It is also used in the manufacture of bricks, tiles, and pottery.
Laterite is found in tropical and subtropical regions around the world. It is most common in the midlands, which are the areas between the high ranges and the coastal belts. The midlands are typically characterized by a warm, humid climate and a high rainfall. These conditions are ideal for the formation of laterite.
The other options are incorrect because they are not the most common areas where laterite is found. High ranges are typically too cold and dry for the formation of laterite. Coastal belts are typically too wet and salty for the formation of laterite. River deltas are typically too flat and low-lying for the formation of laterite.