Concept:Flame colours are used to identify metal ions; calcium salts produce a brick-red flame.Explanation:In a non-luminous Bunsen flame, metal ions in compounds impart characteristic colours.• LiCl gives a crimson-red flame.• NaCl gives a yellow flame.• CaCl2 gives a brick-red flame.• MgCl2 does not give a prominent flame colour.Therefore, the compound that burns with a brick-red colour is calcium chloride.Answer:C. CaCl2