The correct answer is B) To corroborate a primary source's claim about an event.
Why would a historian wish to consult multiple sources of information on a topic?
Answer: To corroborate a primary source's claim about an event.
This is a very important aspect of the historian's job. He/she is looking for valid information in ist research. Historians need to corroborate that the information they are going to write about and share, is true. Historians have credibility and a reputation to maintain, and they won't dare to risk this reputation writing something that is not true or biased.
That is why they must double-check their sources before sharing their reports.