Which one is an example of heterogenous catalysis?

1. A. Oxidation of sulphur dioxide into sulphur trioxide in the presence of oxides of nitrogen
2. B. Hydrolysis of sugar catalysed by H+ ions
3. C. Decomposition of ozone in presence of nitrogen monoxide
4. D. Combination between dinitrogen and dihydrogen to form ammonia in the presence of finely divided iron

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