Una razón para el éxito de la agricultura de los egipcios eran los osarios de la

Nile Irrigation

Explanation:

The Ancient Egyptians were pioneers in Agriculture as they engaged in farming that only few societies were able to at the time they did so. This was done despite the fact that most of their land was unsuitable for Agriculture.

They overcame this massive hurdle by engaging in irrigation of the Nile river and developed complex irrigation systems that directed water from the Nile river where they wanted it to go including to the fields where it watered plants and gave them fertile silt that led to success in farming.

the answer is b: the religion they practice.

here's why:

there were many different native american tribes and those with similar characteristics formed a main tribe or nation. each had its own language, religion and customs.