Concept:Sustainable management of forest resources is the most effective long-term remedy.
Explanation:Rapid depletion of forest resources occurs mainly through overexploitation and poor management.
Introducing forest conservation techniques ensures controlled use, replanting, and protection of existing forests.
This approach addresses the root cause far better than merely creating new plantations, importing wood, or increasing security.
Reserving land for plantations alone does not stop the depletion of existing forests.
Importing wood shifts the problem elsewhere, and employing more guards is only a short-term measure.
Answer:B. Introduce forest conservation techniques.