The correct option is A Organism → Population → Community → Ecosystem
The first level is an individual or an organism. The second level is the population. A population is a group of individual species that live in a specific area. Populations have individuals of the same species. The third level is a community. A community is all the populations together in a specific area.
A community includes the population of different species and organisms. The next level is an ecosystem. An ecosystem includes more than one living community of organisms that interact with the environment. These organisms all depend on other abiotic factors, examples include water, rocks, temperature, and air.