Concept:Lumbering is encouraged by accessible forests, a variety of economic trees, and a strong market demand for timber.
Any condition that makes the forest difficult to reach or exploit becomes a hindrance to the industry.
Explanation:High demand for tropical timber is favourable because it guarantees a steady market and attracts investment in the lumbering business.
The presence of many economic trees, such as mahogany and iroko, is also encouraging, since these species yield valuable and profitable timber.
A high demand for fuel wood equally promotes lumbering activity in many African regions.
However, an inaccessible equatorial forest is not a favourable factor.
Dense undergrowth and poor transport routes inside the rainforest make it difficult for loggers to reach, cut, and move the trees.
This limits the exploitation of timber and increases the cost of lumbering operations.
Thus, among the given options, an inaccessible equatorial forest is the exception that does not favour lumbering.
Answer:D. inaccessible equatorial forest