What is depicted by a production possibilities frontier (PPF)?

The production possibilities frontier (PPF) illustrates the maximum possible output combinations of two goods that an economy can produce given its resources and technology. This graphical representation shows the trade-offs between the production of different goods, highlighting how an increase in one good's output leads to a decrease in the output of another due to limited resources. Points along the PPF represent efficient production levels, while points inside the curve indicate inefficiencies, and points outside are unattainable with current resources. Thus, option B accurately captures the essence of what the PPF represents in the context of economics.