Answer:
B. The input gains from greater international specialization and trade are the equivalent of economic growth.
Step-by-step explanation:
If a country moves outside its production possibilities curve, the country has experienced economic growth, precisely because it has increased the amount of goods it can produce according to the production possibilities curve.
International trade thus facilitates economic growth because it makes each country focus on the production of the goods that have the lower opportunity cost, and therefore, use the country's resources more efficiently. This, added to technological improvements, can help a country's economy become larger in both the short and long-term.