A rising stock market signals investor confidence, as buying activity pushes up prices. When stocks rise, people invested in the equity markets gain wealth. Increased wealth often leads to increased spending, as consumers buy more goods and services when they're confident they are in a financial position to do so.
Aquifers or "water tunnels" could bring water via underground.
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Answer:
In many cases, slaves were promised freedom in exchange for service.
I'm not sure but probably A.