One drawback of voluntary trade is that it a. requires two groups to use a common language b. can make one group dependent upon another for necessary goods c. doesn't occur unless there is a shortage of goods for at least one group d. forces groups to rely on themselves to produce all the goods they need

i think the answer is B

Option B.

Explanation:

Can make one group dependent upon another for necessary goods, is the right answer.

Voluntary trade represents a market where consumers and retailers have the freedom to market and purchase by their own choice or decline to if they so want. It also illustrates an individual's liberty to wish to operate for pay versus being pushed into labor.

B. can make one group rely on the other. :D