Which of the following best completes the diagram below?
?
Pursuit of happiness
Life
Liberty
A. civil rights
B. voting rights
C. Bill of Rights
D. unalienable rights
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