What Would Be a Major Advantage and a Major Disadvantage

What would be a major advantage and a major disadvantage of desalinizing water by freezing?

A) The supply of ocean water is vast, but ocean water is too salty to make this method cost efficient.
B) The supply of ocean water is vast, but this technique is limited to northern coastal regions.
C) The supply of ocean water is vast, but time and energy is better spent hauling icebergs to coastal regions in need of fresh water.
D) all of the above