Which Reaction Is an Example of a Precipitation Reaction

Multiple Choice

Which reaction is an example of a precipitation reaction?

A) H₂CO₃(aq) → H₂O(l) + CO₂(g)
B) H₂SO₄(aq) + Ca(OH) ₂(aq) → CaSO₄(aq) + 2 H₂O(l)
C) 6 HCl(aq) + 2 Al(s) → 2 AlCl₃(aq) + 3 H₂(g)
D) FeCl₃(aq) + 3 KOH(aq) → Fe(OH) ₃(s) + 3 KCl(aq)
E) 2 Hg(l) + O₂(g) → 2 HgO(s)