Na₃PO₄ Dissolves in Water to Produce an Electrolytic Solution

Na₃PO₄ dissolves in water to produce an electrolytic solution.What is the osmolarity of a 2.0 × 10^-3 M Na₃PO₄ solution?

A) 1.0 × 10⁻³ osmolar
B) 2.0 × 10⁻³ osmolar
C) 4.0 × 10⁻³ osmolar
D) 5.0 × 10⁻³ osmolar
E) 8.0 × 10⁻³ osmolar