Most Countries That Lack Safe Drinking Water Do Not Desalinate

Most countries that lack safe drinking water do not desalinate water that may be present in a nearby ocean because

A) it is too hard to remove fish and other wildlife.
B) it is easier to collect and use rainwater.Plus, rainwater is free and readily available.
C) desalination doesn't remove bacteria.
D) desalination plants are expensive to build and use large amounts of energy to operate.
E) None of the above.