这道题怎么做---**Question Stem:** 20 The diagram shows the production possibility curves (PPCs) for country X and country Y, the only two countries in the world. Both countries produce just two goods, M and N. **Chart Description:** * Type: Line chart showing two production possibility curves (PPCs). * Axes: * Horizontal Axis: Labeled "output of good N", with tick marks at 0, 100, and 150. * Vertical Axis: Labeled "output of good M", with tick marks at 0, 100, and 200. * Origin: (0, 0). * Curves: * PPC_X: A straight line labeled "PPC_X". It starts at (0, 100) on the vertical axis and ends at (100, 0) on the horizontal axis. * PPC_Y: A straight line labeled "PPC_Y". It starts at (0, 200) on the vertical axis and ends at (150, 0) on the horizontal axis. **Follow-up Question:** Under which terms of trade will both country X and country Y benefit from trading with each other? **Options:** A 1M for 0.75N B 1M for 0.8N C 1M for 1N D 1M for 2N