Which of the following pairs of ions would be expected to form a precipitate when their dilute solutions are mixed?
- A$Na^{+}, SO_3^{2-}$
- B$NH_4^{+}, CO_3^{2-}$
- C$Na^{+}, S^{2-}$
- D$Fe^{3+}, PO_4^{3-}$
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