The correct answer is alternative D: <em>"To evaluate the perspective of a witness to the event."</em>
A Primary Source of information in this case would be documents, journals, articles, recording, manuscripts or other similar things that were created at the time of the events being analyzed, whereas a Secondary Source is about the same subject, but not from a source of the time of the events.
For this reason, researchers would use a primary source instead of secondary source in order to evaluate the perspective of a witness to the event, or at least of someone who lived at the time the events occurred.
The Founders had been so concerned with making sure the central government couldn't become too powerful that they neglected to make it powerful enough to solve the issues facing a new nation.
This of course depends entirely on the person in question, but generally speaking people who believe in such things would want to come back as animals somewhere at the "top" of the food chain.