Alkyl benzene sulphonates can be used as detergents in hard water,unlike soaps,as

• A
  They are highly soluble in water
• B
  Their $Ca^{2+}/Mg^{2+}$ salts are water soluble
• C
  They are non-ionic
• D
  Their $Ca^{2+}/Mg^{2+}$ salts are insoluble in water