describe the development of the Merovingian and Carolingian kingdoms. including the expansion of government, the relationship between the Catholic Church and the Merovingian and Carolingian kingdoms, and the key figures in the evolution of the Merovingian and Carolingian kingdoms.

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