Which source would best a historian understand how the great chicago fire affected families

Assuming that this is referring to the same list of options that was posted before with this question, the correct response would be the "diary or journal" of one of the affected family members, since this would be a primary source document.

Wiesel was 15 years old when the Nazis deported him and his family to Auschwitz-Birkenau. His mother and younger sister died in the gas chambers on the night of their arrival at Auschwitz-Birkenau. He and his father were deported to Buchenwald where his father died before the camp was liberated on April 11, 1945.