What evidence shows that the Indus Valley people were an advanced civilization? A. long poetic texts known as Vedas

B. brick houses with drains and bathrooms

C. social classes, or varnas

D. an extensive system of aqueducts between cities

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