Which of the following conclusions about the slave trade is most valid based on the historical record? it prevented brazil from becoming a prosperous country. it caused africans to unite and support the abolition of slavery. it affected millions of africans. it caused europeans to establish colonies in the americas.

Ahistorian has discovered a letter written by an early roman emperor. she translates the letter and discovers that it contains orders to a general before a battle. she works to determine when the letter was written to figure out which battle the letter references.the historian in the passage is most clearly demonstrating which historical thinking skill? a. identifying causes and historical contextb. thinking chronologicallyc. making and evaluating arguments and interpretationsd. analyzing historical sources