Maximum Sustainable Yield or MSY is commonly used to manage fish and wildlife populations. MSY aims to balance harvesting too much with not harvesting enough of a crop and in doing so, allowing the population to exist in a state that allows for maximum reproduction rates. This is an example of
选项：

A:sustainable farming.
B:tragedy of the commons.
C:overfishing.
D:pest management systems.
E:reaching carrying capacity.