Why is it important for historians to create graphs from primary sources?

The correct answer to this open question is the following.

It is important for historians to create graphs from primary sources for the purpose of getting the information more clearly and visually so everybody can access the information a can understand it. A primary source is the one that was the product of people who witnessed the event or the incident. It could a testimony, a letter, an interview. So historians could create graphics to better explain the sequence of events, dates, and characters that participated in that part of history.

answer; ///i believe that the correct answer is (a) the great depression

b.   jim crow laws were enacted in northern states.