The community is the group of organism, which live in the same area. in a community, the organism depend on each other for the survival. In a biological community, all the living organism including plants, animals and the microbes are present. Each species in a community has its specific contribution, which affects other species. For example, a forest, a garden, a national park etc.
The population is defined as the group of similar organism living in a specific area, which can interbreed and produces a viable offspring. For example: lions in a forest, or cows in a village.
Hence, the correct answer is option D) All the different animals in a national park would be a community; all of the brown bears in the park would be a population.