What is the net effect of importing and exporting of goods and services through international trade?

a) Only export of goods result in gains from trade.
b) Only import of goods lead to gains from trade.
c) usually only one of the trading nations get gains from trade, the more highly developed one.
d) Both nations engaged in trade receive net gains from trade from both their exports and their imports.
Well this is all I have to work with. If the correct answer is not here, what would be the most logical answer of the ones listed?

d)

Foreign Trading Tips & Advice : Importing Goods & Quality Control

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