Suppose you wanted to form BaCO₃ as a precipitate in an aqueous reaction. What aqueous solutions would you choose as reactants?
a. Ba (NO₃)2 + Na₂CO₃
b. Na₂SO₄ + BaCl²
c. Ba (OH)2 + H₂CO₃
d. BaSO₄ + Na₂CO₃

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