5. Which of these is an example of an incentive?
A. An economic policy in a country
B. The highest price that can be charged for a good or service
C. A drop in the price of a product
D. An industry owned and controlled by a government

I think the answer is A. An economic policy in a country

2686-2181 bce-- "egyptian civilization developed along the nile river in large part because the river’s annual flooding ensured reliable, rich soil for growing crops."

1069-664 bce-- "ancient egyptians developed wide-reaching trade networks along the nile, in the red sea, and in the near east."