Which of the following, identified in an analysis of the general environment, is an opportunity for an entrepreneur who wishes to open a business providing "fitness for life" physical conditioning services (strength, balance, and flexibility training) in a city of 100,000 people? a. the average age of the population in his community is high. b. the level of unemployment in his community is high. c. a chiropractor and two independent physical therapists are located in his community. d. the average education level of the population in his community is low.