Answer:
A. A positive sum game
Step-by-step explanation:
A postive-sum game is a form of game theory whereby the total of gains and losses is greater than zero. The comparative advantage theory by David Ricardo discusses why it is important for countries to specialize in the production of goods and services they have lower opportunity cost in producing and to trade for what they don't produce. This is considered a positive sum of game because countries engaging in comparative advantage wins at no one's expenses. It is mutually beneficial to all party involved.