An aqueous solution of calcium chloride is mixed with an aqueous solution of sodium carbonate at 25∘C. A white solid rapidly forms and settles. Which of the following best classifies the reaction?
a) Acid–base neutralization producing H2O
b) Gas–evolution reaction producing CO2 gas
c) Precipitation resulting from the formation of insoluble CaCO3
d) Oxidation–reduction with calcium being reduced