Ion-Exchange Resins Can Remove Mg²⁺ and Ca²⁺ in Water (Called

Ion-exchange resins can remove Mg²⁺ and Ca²⁺ in water (called softening) by releasing Na⁺.What would be the concentration of sodium ion in the softened water if the combined concentration of these Group 2A ions that were removed from the hard water was 0.026 M ?

A) 0.052 M
B) 0.26 M
C) 0.13 M
D) 0.00 M
E) Can't tell; necessary information is lacking.