The first step with any local rule question is to draw the new rule onto a diagram.
In the setup, we saw that placing FM on the middle determines everything. When FM are on the middle shelf, G can’t go on the top shelf. So FM must go on the bottom shelf for this question.
Both K and O have to be on either the middle or the top shelf. We saw this in the setup. K is above F and O is above L. That leaves at least one of L and H to fill the third space on the bottom shelf.
(The other L/H could go on another shelf.)
There are, at most, three spaces left for K and O: one or two on the middle shelf, and one on the top shelf. I’ve drawn them up and to the right as a reminder that they must be placed somewhere above the bottom shelf.
The wrong answers fail because of this. They put too many variables on the middle shelf, and thus there’s no room for K and O to go above F and L.
A is tricky if you forget that the answer choices show us a complete list. H and I could go on the middle shelf if one of K and O went there too, but H and I can’t go there alone.
B has the same problem as A. We’d need L, I and one of K and O for it to work.
C is even worse. There’s only one spot on the top shelf left for K and O, and no spots left on the middle.
D is CORRECT. This diagram shows how it could work.
E is wrong because if FM are on the middle shelf then both K and O must go on the top shelf, forcing G onto the bottom. It’s the scenario from the setup and question 20, where everything falls into place.
It’s a major part of the game. If you’re not sure how it works, reread the setup and try to create the scenario yourself. Start by placing FM on the middle shelf, and apply each rule in turn. It’s a necessary skill to learn.
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