When sodium oxalate, Na₂C₂O₄, dissolves in water, what ions are present?

Options:
A) Na₂₂ C₂O₄₂–
B) 2 Na C₂O₄₂–
C) 2 Na₂ C₃ 4O₂–
D) 2 NaC₄₄ O₂–