- (A) Microfiltration is not typically used for desalination as it only removes large particles, not dissolved salts.
- (B) Electrodialysis uses an electric field to move ions through selective membranes and is used for desalinating water.
- (C) Ultrafiltration is similar to microfiltration and does not remove dissolved salts, so it is not used for desalination.
- (D) Reverse osmosis is the most common and effective method for desalinating water by forcing it through a semi-permeable membrane that removes dissolved salts.
Thus, the correct answers are:
\[
\text{(B) Electrodialysis}, \text{(D) Reverse osmosis}.
\]
Final Answer:
(B) Electrodialysis, (D) Reverse osmosis.