The region of Biosphere Reverse which is legally protected and where no human activity is allowed is known as Restoration zone, Core zone, Transition zone, Buffer zone

Biosphere reserves are traditionally organized into three interrelated zones known as core zone, buffer zone, and transition zone. The region of biosphere reserve which is legally protected and where no human activity is allowed is known as core zone. Buffer zone may accommodate education, training, tourism and recreation. Transition zone is the large outer area of a reserve where people live and work, using the natural resources of the area in a sustainable manner. Thus, option B is the correct answer.