Why Is It Significantly Less Costly to Purify Fresh Water

Multiple Choice

Why is it significantly less costly to purify fresh water through reverse osmosis than to purify salt water through reverse osmosis?

A) The osmotic pressure exerted by fresh water is less.
B) The osmotic pressure exerted by fresh water is greater.
C) For non-coastal regions,the salt water needs to be transported many miles from the oceans.
D) The expense of reverse osmosis is not dependent upon the salt concentration in the water.