Which of the following was NOT unique about the Incas? * 1
O They had a massive system of roads
They worshiped a pantheon headed by a sun god
Their written language was a system of knots called quipu
O They were the largest empire in the Americas
NEED AN ANSWER PLEAS

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