4、Which of the following is true about open-access allocation of common-pool resources?
选项：

A:
A:Private users will have an incentive to protect scarcity rent.;
B:
B:Individual users take into account the opportunity cost of overexploitation.;
C:
C:In the presence of sufficient demand, unrestricted access will cause resources to be overexploited.;
D:
D:Individual users can exercise exclusivity over the resources.