6. Simmel's essay, “Metropolis and Mental Life," has been important in the development of A. the social psychology of city life. B. the political economy of city life. C. the ecology of city life. D....

Extracted text: 6. Simmel's essay, “Metropolis and Mental Life," has been important in the development of A. the social psychology of city life. B. the political economy of city life. C. the ecology of city life. D. the religious aspects of city life.