When External Scale Economies Exist in an Industry, New Trade

When external scale economies exist in an industry, new trade opportunities will cause:

A) the consumers in both the exporting and the importing countries to gain.
B) the consumers in the exporting country to gain but the consumers in the importing country to lose.
C) the consumers in both the importing and exporting countries to lose.
D) the consumers in the importing country to gain but the consumers in the exporting country to lose.