The correct option is C B and D
Natural habitats like forests do not require artificial fertilisers. The fallen leaves, twigs, fruits, dead animals and their excreta, provide the organic matter to the forest soil. Wild animals are also one of the modes of seed dispersal. When they eat fruits, the seeds contained in them do not get digested due to their hard shells and are dispersed through their fecal matter. Decomposer cycles are operated by microorganisms which act upon fallen leaves and other organic matter and decompose them into simpler forms. In the absence of vegetation, there will be no leaves or animal waste on the ground to be decomposed, thereby affecting the decomposer cycle.
Education can make the people aware about the adverse effects of deforestation and can also equip them with various measures to increase forest cover.