Answer: B, Maximum Sustainable Field
Explanation: Maximum sustainable yield refers to the highest rate of resource exploitation that can continue indefinitely, taking into account the rate of renewal or replacement of the resource. The concept of MSY is applied to renewable resources such as fish populations, forests, and wildlife, and is based on the idea that these resources can be used in a sustainable manner over time, as long as the rate of exploitation does not exceed the rate at which the resource can be replenished.
In contrast, conservation refers to the preservation of resources, typically through protective measures such as regulations and restrictions. Preservation refers to the protection of resources without any use, while perpetual resource refers to a resource that is considered to be available in unlimited quantities.