I pick A

Question

one drawback of voluntary trade was that it

1. requires two groups to use a common language
2. can make one group dependant upon another for necessary goods
3. does not occur unless there is a shortage of goods for atleast one group
4. forces groups to rely on themselves to produce all the goods they need

Answer 1

No. Study this site.

http://www.businessdictionary.com/definition/voluntary-trade.html