This answer is c value of each option
The answer is the North Vietnamese took over the South Vietnam spreading communism Southward and this proved the domino theory (if one country come under the influence of communism, the surrounding countries would follow).
I believe it is unemployment. I think GDP and unemployment are the two main factors in the business cycle.
This depends greatly on the time period in question, but during the Enlightenment, many Europeans believed "the citizens" were in charge of all things including governmental systems.
