imagine a 2,000-acre park with picnic benches, trees, and a pond. suppose it is publicly owned, and people are invited to enjoy its beauty. when the weather is nice, it is difficult to find parking, and the trash cans overflow with food wrappers on summer afternoons. otherwise, it is a great place. the park is a common resource because a. access is limited due to driving distances. b. anyone can use it without affecting anyone else. c. if too many people use it, one person's use diminishes other peoples' use. d. people can be prevented from using it.