A Historian would look for a primary source (option d. ) - the definition of a primary source is that it was written at the time of the event, and not later (this is the secondary choice).
Answer:
Communist
the communist wanted equality and everyone had to have the same as everyone else
Both want a change from being ruled by an absolute ruler, both have economic instability from war debt, both have social inequality. And also, both started because of enlightenment ideas.
