A Friend Informs You That She Is Planning to Purchase

A friend informs you that she is planning to purchase a water softener.Which statement is most appropriate for you to make to your friend?​

A) Hard water makes more bubbles with less soap than soft water and is more desirable.
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) ​There is no difference in mineral content of soft and hard waters.