(Figure: The Production Possibility Frontiers for Jackson and Tahoe) Use Figure: The Production Possibility Frontiers for Jackson and Tahoe. In autarky, Jackson produces and consumes 30 head of cattle and 80 bushels of wheat, while Tahoe produces and consumes 80 head of cattle and 60 bushels of wheat. With complete specialization according to comparative advantage, the two nations' combined production of wheat will:
A) remain constant.
B) increase by 120 bushels.
C) increase by 60 bushels.
D) decrease by 60 bushels.