Detergents are more advantageous than soaps in hard water districts because

• A on treatment with hard water they either form soluble calcium salts or do not react with calcium ion
• B on treatment with hard water they form soluble calcium salts
• C on treatment with hard water they form sodium salts
• D on treatment with hard water they are converted into soaps
• E on treatment with hard water they form more lather than soaps does