Read each question and choose the best answer. A graph shows a production possibilities curve. The horizontal axis is for watermelons in millions of tons and the vertical axis is for shoes in millions of pairs. The curve falls through the following points: (0, 15), (8, 14), (14, 12), (18, 9), (20, 5), and (21, 0). The point at (0, 15) is labeled Line b on the curve in the chart is referred to as— A. the production-possibilities frontier B. the production-possibilities opportunity cost C. the resource plot point D. the resource prediction curve