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Which describes a process where a precipitate is formed?

A.
A solution of AgNO3 is added to a solution of CaCl2 to produce solid AgCl and a solution of CaNO3.

B.
Propane gas combusts to form CO2 and H2O.

C.
A solution of HCl mixes with a solution of Ca(OH)2 to produce H2O and CaCl2.

D.
A solution of H2SO4 mixes with a solution of NaOH to produce water and Na2SO4.