Pls help Anwser with A or B will get 15 points

A-United States of America B- Confederate States of America
2. Included Kentucky, Ohio, and Pennsylvania.
3. Included Virginia, South Carolina, and Florida.
4. Had a significantly larger population.
5. Had better military leadership in the field.

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