|Question 18Verbal

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Text
In 19th-century Bengal, cowry shells were used as a commodity currency. By using specific goods like cowry shells as common units of exchange, commodity currency economies streamline trade, which is why they often replaced barter economies. Barter economies eschew _____ that requires what economist W.S. Jevons deems a "double coincidence of wants"–in other words, each trading party must want precisely what the other has.
Which choice completes the text so that it conforms to the conventions of Standard English?
currency, in favor of a direct trade system
A
currency-in favor of a direct trade system
B
currency in favor of a direct trade system
C
currency, in favor of a direct trade system,
D