I forgot my book at my friends house.

Answer the questions in the image for brainliest

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

Clara barton was the first nurse in the united states of america. true or false?