The correct option is
A A-Transition Zone
B- Buffer zone
C-Core zone
D- Human settlement
Biosphere reserves – They represent natural biomes which contain unique biological communities. They include land as well as coastal environment.
Biosphere reserves were created under MAB (Man and Biosphere) programme of UNESCO in 1971. Till May 2000 there were 408 biosphere reserves in 94 countries of the world. In India there are 15 biosphere reserves. There are 3-zones in a biosphere reserve.
1. Core (natural) zone – It is inner most zone which is legally protected and completely undisturbed from human interference.
2. Buffer zone - In this zone limited human activity is allowed for research and education purposes.
3. Transition (manipulation) zone – It is the outermost zone of biosphere reserve in which large number of human activities are permitted, eg. Cultivation, domestication, harvesting of natural product, grazing, forestry, settlement and recreation etc. In this zone the traditional life style of tribals is protected with their live-stock.
4. Human settlement- Where humans live