I need help. No links plz

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

Which of the following was probably the most difficult challenge facing construction of the railroad?

Why did kennedy choose lyndon b. johnson to be his running mate