Question

historians make interpretations about events based on
novels based on the past.
the opinions of journalists
interviews with citizens.
the evidence they collect

Explanation:

Historians rely on evidence they collect (such as primary sources like documents, artifacts, etc.) to make interpretations about historical events. Novels are fictional (even if based on the past), journalists' opinions are not historical evidence in the strict sense, and interviews with citizens (unless they are primary - source interviews related to a specific historical event) are not the main basis. The key is that historical interpretation is evidence - based.

Answer:

the evidence they collect