The Apache people . a.
believed they had to raid other societies in order to survive
b.
believed the most important thing was taking care of their families.
c.
saw their lives as difficult because they often did not have enough food to eat.
d.
all of the above

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