In the following table, what is the opportunity cost to Libraryland of increasing the production of books from 200 to 300?
A、100 magazines.
B、150 magazines.
C、200 magazines.
D、350 magazines.
微观经济学（全英）

章节列表

1. General Overview of Economics282. Principles of Economics353. Circular-Flow Diagram and PPF204. Interdependence and Trade205. Demand and Supply756. Elasticity717. Price Control and Taxation408. CS, PS and the Efficiency of Markets109. Costs of Taxation2510. International Trade3011. Externalities3112. Public Goods and Common Resources2013. The Costs of Production20