The Ogallala Is Which of the Following

The Ogallala is which of the following?

A) a massive desalination plant in the Middle East
B) the world's largest known aquifer
C) a pumping station drawing fresh water from the Great Lakes for use in the S.W. a.United States
D) a large body of water in Russia that has almost completely dried up
E) a river in the Middle East that flows into the Mediterranean Sea, and has the potential to become dried up due to extensive irrigation systems