Concept:Tropical African manufacturing is limited by supply-side shortages, not by an excess of labour, skills, or goods.
Explanation:Most manufacturing industries in Tropical Africa face a serious shortage of local raw materials.
They rely heavily on imported inputs because local agriculture and mining are not well linked to industry.
Labour supply is large and wages are generally low, so the cost of labour is not the main problem.
Industrial labour in the region is often unskilled or semi-skilled, not high in quality.
Overproduction is rare because factory output is small and purchasing power within local markets is limited.
Therefore, the biggest obstacle is the inability to obtain steady, adequate raw materials for production.
Answer:C. inadequate raw materials