Answer the question on the basis of the following production possibilities table for two countries, North Cantina and South Cantina. Capital Goods Consumer Goods North Cantina Production Possibilities A B D E F 5 4 3 2 1 o 0 10 18 24 28 30 Capital Goods Consumer Goods South Cantina Production Possibilities A B D E F 5 4. 3 2 1 0 0 8 15 21 27 25 Refer to the table. If South Cantina is producing at production alternative C, the opportunity cost of the fourth unit of capital goods will be