Concept:Industries are often located near the source of bulky raw materials to reduce transport costs.
Explanation:The iron and steel industry needs large quantities of iron ore and coal.
Iron ore is found at Itakpe, which is close to Ajaokuta.
Coal is found at Orukpa and Okaba, also within a favourable distance.
These two raw materials strongly explain why Ajaokuta was chosen.
Limestone at Ewekoro is too far away and is not a major locational factor here.
The river port at Lokoja is helpful but less important than the mineral resources.
Thus, the presence of iron ore and coal is the best explanation.
Answer:C. I and IV only