A large excess of MgF₂(s) is maintained in contact with 1.00 L of pure water to produce a saturated solution of MgF₂. When an additional 1.00 L of pure water is added to the mixture and equilibrium re-established, compared with the original saturated solution, will [Mg²⁺] be 

(a) The same; 

(b) Twice as large;

(c) Half as large; 

(d) Some unknown fraction of the original [Mg²⁺]? Explain.