Which of the following defines the difference between Ecosystem, Communities, and Populations?

A) Ecosystems focus on abiotic factors, while communities focus on biotic factors, and populations focus on both.
B) Ecosystems involve interactions among populations and their physical environment; communities involve interactions among populations; populations consist of individuals of the same species in a given area.
C) Ecosystems refer to a specific geographic area, communities refer to all organisms in a given area, and populations refer to all individuals of a species in a given area.
D) Ecosystems are composed of biotic and abiotic components, communities consist of populations of different species, and populations consist of individuals of the same species.