Desalination plants are unnecessary in egypt and turkey because an adequate amount of

freshwater flows through their countries.
freshwater is shipped in from outside sources.
rain provides enough freshwater for residents.
snow provides enough freshwater for residents.

In my opinion your answer is A.) Freshwater flows through their countries.  Egypt alone can get at least 0.79 inches of rain per year.  It doesn't snow in Egypt.  As far as I know water isn't shipped in.  You can look up rivers in Egypt and Turkey and find that the Nile River is a major supply of water to the people. 

The correct answer would be A: freshwater flows through their countries.

I believe the answer your looking for is A correct me if I'm wrong hope this helps.