Nubian Aquifer in northern Africa

The Nubian Aquifer in northern Africa is one of the largest groundwater reserves in the world. Why is its exploitation not sustainable?

A)The exploitation of the Aquifer is economically not efficient due to the geographical remoteness

B)The Aquifer is situated in an arid environment and cannot be renewed in the near future

C)The Aquifer is situated in politically unstable regions and will create further conflict

D)The Aquifer could be polluted in the process

E)All of the above