Why Isn't Distillation Used Commercially to Purify Water

Multiple Choice

Why isn't distillation used commercially to purify water?

A) Water requires large amounts of energy to boil affordably.
B) Bacteria are not killed during the distillation process.
C) Odd smelling contaminants boil at lower temperatures than water and so are impossible to remove.
D) Distillation does not remove suspended particles such as dirt and humus.
E) none of the above