Concept:Industrial growth depends on capital, labour, technology, and infrastructure. Their shortage slows development.
Explanation:Many Tropical African countries have limited financial resources.
This shortage of capital makes it hard to build new industries or expand existing ones.
Without enough investment, factories cannot buy machinery, raw materials, or energy.
The other options describe conditions that support industrial progress, not slow it down.
Therefore, poor capital availability is the main hindering factor.
Answer:A. Inadequate capital