This selection is mainly about
A why many large ports have closed in recent years.
B different types of explosives and how they work.
C major international harbors and the goods they trade.
D how to travel quickly and easily during times of war.
This selection is mainly about major international harbors and the goods they trade
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The correct answer is C major international harbors and the goods they trade.
Explanation: The question asks about the main focus of a selection. Since the options include discussions about ports and international trade, option C is the most relevant, as it suggests a broader overview of significant harbors and their trading activities, which is likely the primary theme of the text.