Assume that labor is the only factor of production and that wages in the United States equal $20 per hour while wages in Japan are $10 per hour. Production costs would be lower in the United States as compared to Japan if A. U.S. labor productivity equaled 40 units per hour and Japan's 15 units per hour. B. U.S. labor productivity equaled 30 units per hour and Japan's 20 units per hour. C. U.S. labor productivity equaled 20 units per hour and Japan's 30 units per hour. D. U.S. labor productivity equaled 15 units per hour and Japan's 25 units per hour. E. U.S. labor productivity equaled 15 units per hour and Japan's 40 units per hour.