Which Trade Pattern Is BEST Explained by Increasing Returns

Which trade pattern is BEST explained by increasing returns?

A) Honduras exports bananas to the United States,and the United States exports airplanes to Honduras.
B) Pakistan exports clothing to the United States,and the United States exports airplanes to Pakistan.
C) Japan exports cars to the United States,and the United States exports airplanes to Japan.
D) Mexico exports beef to the United States,and the United States exports airplanes to Mexico.