46. What is the sustainable biosphere initiative? (A) A plan to convert all natural ecosystems in the biosphere to carefully engineered ones. (B) A program that uses adaptive management to experiment and learn while working with disturbed ecosystem. (C) A conservation practice that sets up zoned reserves surrounded the buffer zones. (D) A research agenda to study biodiversity and support sustainable development. (E) The declining population approach to conservation that seeks to identify and remedy causes of species' declines.