The ancient Persians made many improvements to their empire, such as building canals linking bodies of water, as well as building roads and ports. Which of these was the most likely result of the building projects?

A.
Flooding created a lot of damage throughout the region.
B.
Trade began expanding throughout the Near East region.
C.
Fighting began over control of these improvements.
D.
People used these as transportation to migrate out of the area.