Marsh Bedouins comprise a culture that has existed for thousands of years. They live and rely on the Euphrates River for their entire existence.

Which of the following is the most likely reason the Marsh Bedouins still live on the Euphrates?
A.
The Bedouins are afraid to leave the marshes.
B.
The economy they created still serves their needs.
C.
The Marsh Bedouins will only eat a diet of fish.
D.
The Marsh Bedouins will only live in reed huts.