The Main Theme of Lewer and Van Den Berg's (2007)

The main theme of Lewer and Van den Berg's (2007) manuscript International Trade and Economic Growth is:

A) the greatest gains from international trade are derived from it's impact on long-run economic growth.
B) the largest gains from international trade come from it's impact on short-run efficiency gains.
C) the largest gains from international trade come from it's impact on factor accumulation.
D) the largest gains from international trade come from it's impact on macroeconomic policies.