Answer:
D. a journal excerpt from a person involved in the event in question
Explanation:
The person involved in the event would be the best person to know what happened in the event because they were there and could experience exactly what was happening. A documentary, article, and analysis would not be primary source because the people who wrote them were not there at the event.
Usually bad working conditions and low wages
Limited Freedom, Inefficient use of productive resources, and usually not much economic growth would all be correct.