Imposing some sort of cost on trade that raises the price of the traded products is most likely an example of a) a trade barrier. b) a trade surplus. c) a trade deficit. d) a trade incentive.

A trade surplus or trade deficit (answers B and C) refer to the relationship between the exports and imports and not to the cost on trade. 
A trade incentive is something that encourages the trade cost on trade is not an incentive. 
The correct answer a trade barrier. 

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