A Friend of Yours Is Planning to Purchase a Water

A friend of yours is planning to purchase a water softener. What is the most appropriate advice that you can give to your friend?

A) Hard water lathers better with less soap, so it is better for cleaning and bathing than soft water.
B) Soft water leaves a ring in the tub and a gray residue in the wash, which are undesirable.
C) Soft water appears to aggravate hypertension, which is undesirable.
D) Soft water has higher concentrations of calcium and magnesium than hard water, which is desirable.
E) Hard water dissolves contaminant metals more easily than soft water