Direction: In the following question, sentences of a paragraph have been jumbled and labelled as A, B, C and D. You are required to rearrange the jumbled sentences of the paragraph and mark your response accordingly by selecting the correct option.

A. In the biosphere living beings are interrelated and interdependent on each other for survival. 
B. Natural vegetation and wildlife exist only in the narrow zone of contact between the lithosphere, hydrosphere and atmosphere
C. This life supporting system is known as the ecosystem.
D. This narrow zone of contact is called the biosphere.