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The given question requires us to match the items in List I with their corresponding descriptions in List II and select the correct answer using the code provided.
List I:
A. Iron oxide
B. Varnish
C. Enamel paint
D. Emulsion paint
List II:
1. Glossy finish on wood and steel
2. Colourless shining protective coating on wood
3. Exterior and interior brick walls
4. Preparatory coating on steel
From the options provided, the correct code is 3.
In this code, A corresponds to option 4, which matches `Preparatory coating on steel` with Iron oxide. B corresponds to option 2, which matches `Colourless shining protective coating on wood` with Varnish. C corresponds to option 3, which matches `Exterior and interior brick walls` with Enamel paint. D corresponds to option 1, which matches `Glossy finish on wood and steel` with Emulsion paint.
Therefore, the correct answer is option 3. Each item in List I is correctly matched with its corresponding description in List II according to the code provided.