Which of the Following Equations Correctly Describes the Relationship Between

Which of the following equations correctly describes the relationship between the concentrations of Sr²⁺ and PO₄^3- ions in a saturated solution of Sr₃(PO₄) ₂(s) ?

A) 3[Sr²⁺] = 2[PO₄^{3 -} ]
B) [Sr²⁺] = [PO₄^{3 -} ]
C) 2[Sr²⁺] = 3[PO₄^{3 -} ]
D) [Sr²⁺] = 2/3[PO₄^{3 -} ]
E) none of the above