Which one of the following pairs of compounds illustrates the law of multiple proportion ?

The same elements must be involved in different proportions to form two or more compounds. Only such examples illustrate the law of multiple proportions. Sn & Cl2 combine to form SnCl2 and SnCl4. The masses of  Chlorine combining with fixed mass of  ‘Sn’ are in the ratio of 1 : 2 This illustrates the law of multiple proportions