5 is alone on the bottom shelf and there are two dishes on the middle shelf:
The vertical lines mean those shelves are full.
We know 6 is one above or below 5. And 2 is above 6. So 6 is in the middle and 2 is on top:
We know 1 and 4 have to be in different groups. There are only two groups left, since 5 is alone on the bottom:
Finally, only the top group has space left for 3:
We’re looking for two dishes that must be on the top shelf. That’s 2 and 3.
C is CORRECT.
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