What does it mean when a historian uses chronological thinking to study history?
a. the historian studies the writing of history.
b. the historian retells a historical event in the form of a story.
c. the historian organizes ideas into past, present, and future.
d. the historian analyzes a secondary source.

Which source would best a historian understand the effect of the great chicago fire on families? a. a biography of a chicago family displaced by the fire b. a letter from a grandmother in new york to her family in chicago c. a newspaper editorial about families who were displaced d. an oral history dictated by an adolescent who fled the fire