Addition of an oxalate solution to an aqueous solution containing a mixture of $Ba^{2+}$,$Sr^{2+}$,and $Ca^{2+}$ ions will precipitate:
- A$Ca^{2+}$
- B$Ca^{2+}$ and $Sr^{2+}$
- C$Ba^{2+}$ and $Sr^{2+}$
- DAll the three
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