B and C makes sense to me

Actually Welcome to the Concept of the history.
=> Potatoes and quinoa were among the unique crops; Camelids (llamas and alpacas) and guinea pigs were the unique domesticated animals.
=> The Incan civilization was predominantly agricultural. The Incas had to overcome the adversities of the Andean terrain and weather.
They believe that they would be ignored if representation was based on population while large states, because they will not have the same advantages that the big states have.
Answer:
it was written by someone who researched many sources to write a summary of an event
Explanation:
B
They switched from kinship like tribes to social heirarchy w/ nobles.