Why was poison gas a potential hazard for the troops that used it? O A. Protective gas masks had not yet been invented.
O B. Safety protocols at the weapons plants were limited.
O C. The artillery that delivered it often misfired.
O D. The wind could change direction and kill the wrong troops.

Who believed that the best economic system was one in which businesses compete to gain profit with minimal or no government control? a. thomas hobbes b. john locke c. adam smith d. jean-jacques rousseau

What event had weakened florida’s economy immediately before the start of the great depression? a) the freezing of orange trees b) the end of florida’s land boom c) the start of another world war d) the building of florida’s railroads

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