Concept:The slow pace of industrial growth is caused by a structural imbalance in the Nigerian economy.
Explanation:Nigeria depends heavily on revenue from crude oil sales to finance its national budget.
This heavy reliance makes the economy very vulnerable to changes in world oil prices.
When oil prices fall, government earnings drop sharply, leaving less money for investment in other sectors.
Industries such as agriculture and manufacturing receive reduced attention and funding.
As a result, their growth is slowed, and the broader industrial base remains underdeveloped.
Therefore, the main reason for slow industrial growth is the over-dependence on the oil sector.
Answer:D. over-dependence on the oil sector.