Concept:Climax vegetation is the stable plant community that develops when natural succession is left undisturbed for a long time.
Explanation:In the Nigerian savannah belt, the natural climax would normally be a denser woodland or dry forest.
Bush burning is the regular practice of setting fire to grasses and vegetation, usually during the dry season.
These fires destroy young trees, seedlings, and shrubs before they can establish themselves.
Because the fires occur repeatedly, woody plants cannot outgrow the grass cover.
This constant disturbance prevents the ecological succession from advancing toward the climax stage.
Animal grazing mainly reduces grass cover, lumbering is restricted to forest areas, and mining is localised in effect.
Bush burning, however, affects the entire plant community across wide areas and is the major factor that interrupts the development of climax vegetation in the savannah.
Answer:D. Bush burning