Im not sure exactly what your looking for but it may be something on the lines of: Historians base interpretations of past events on first hand sources which consist of diaries and writing or recordings of people who were at the event. A long with other sources such as newspapers.
The other options of the question were B) interviews with citizens.
C) opinions they have heard. D) historical novels.
Historians base interpretations of past events on evidence they collect.
That is why it is of the utmost importance that historians do research using valid sources of information. It can be primary or secondary sources that validate the time, the place, the characters that were part of an event or incident. Otherwise, they put their credibility at risk.
