(Figure: Bicycles and Radishes I) The figure shows production possibility frontier for two countries that produce only radishes and bicycles. The axes of both graphs are measured in equivalent units. Country A. is now operating at point M, and Country B. is now operating at point N. The opportunity cost of producing an additional ton of radishes would be greater in: A、 Country A. B、 Country B. C. neither; the opportunity cost would be the same in both countries. D. There is not enough information given to answer the question.