Many Proposals Have Been Put Forth for Improving Desalinization

Multiple Choice

Many proposals have been put forth for improving desalinization.Which of the following is not one of these?

A) operating ships that carry desalination equipment offshore
B) operating desalination plants by solar energy
C) using ocean wave energy for desalination plants
D) building desalination plants next to coastal energy plants to use their cooling water
E) letting natural evaporation remove the water in large shallow basins