Imagine a 200 Hectare Park with Picnic Benches, Trees, and a Pond

Multiple Choice

Imagine a 200 hectare park with picnic benches, trees, and a pond. Suppose it is publicly owned, and people are invited to enjoy its beauty. Of course, when the weather is nice it is difficult to find parking, and the rubbish bins overflow with food wrappers on summer afternoons. Otherwise, it is a great place. The park is a common resource because

A) when rubbish bins overflow, a negative externality becomes a positive externality.
B) it is not fenced to control access.
C) if too many people use it, one person's use can prevent others from using it.
D) you have to drive to get there and the car is a private good.