Water, containing hardness of 5.0 milliequivalent/litre, is to be removed using an ion exchange softener. Available resin material has the hardness exchange capacity of 100 kg/m$$^3$$. The volume of resin required to treat 10,000 m$$^3$$/d of water is _______________

A

0.5 $$m^3$$

B

5.0 $$m^3$$

C

12.5 $$m^3$$

D

25.0 $$m^3$$