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I: 4 X atoms and 12 Y atoms are spotted

II: 4 molecules; each are comprised of 1 X atom and 3 Y atoms

III: 4 molecules; each are comprised of 1 X atom and 2 Y atoms

IV: 2 sets of diatomic molecules are spotted; 2 diatomic molecules of X and 6 diatomic molecules of Y

a. only descriptions II and IV

b. descriptions II, III, IV

c. only descriptions III and IV

d. only descriptions II and III

Is the correct choice d. II and III? (Am I supposed to look at the numbers of element to determine if the mass ratios are whole numbers of each other?)

Thanks.