The correct answer is the option (D) a biosphere.
Ecology is the study of the interaction of the living organisms with the abiotic factors. It is organized into various ecological levels.
The levels of organization in an ecosystem includes the lowest level made up of the individual to the highest level of biosphere. The hierarchy of organization includes the individual → population → community → ecosystem → biome → biosphere. The individuals represent the living organisms and a group of similar individuals capable of interbreeding amongst themselves make up the population. Many such populations interacting with each other form the community and their interaction with the abiotic components forms the ecosystem. Biome refers to the large communities of flora and fauna in a particular habitat.
The ecological category which is broader than the biome is the biosphere which is the biological component of the earth including the hydrosphere, lithosphere and the atmosphere.
