What impact did the building of canals have in china during the song and tang dynasties?

a.
the canals were eventually used for military routes.

b.
the canals improved irrigation systems in the rice fields.

c.
the canals made it easier for neighboring nations to attack china.

d.
the canals connected waterways which increased trade.

i only have part a but here is the first one: - lewis and clark are born

- lewis marries sacajawea and clark is jealous  

- clark drowns lewis and then goes to jail

i believe the answer is: returns on investments, no wages

people who belong in upper class society would most likely get there by obtaining multiple source of income, which a certain percentage of ownership for businesses. since most of them are job creator, they would most likely get their money from profit, not wages.

answer; group think;