None of above is the answer that is it
Greece was the modern country that was a part of the Persian empire.
Answer:
(i used both noun and verb for silt)
polytheistic - They needed to become polytheistic in order for the Egyptians to except them into their religion.
(1 noun) <em>silt</em> - There was a lot of silt in the river and it got clogged by the end of the month.
(2 verb) <em>silt</em> - The river had to get silted in order to carry the correct amount of water.