This question asks how to fully determine the order. This means that the answer we pick must cause a chain reaction. To figure out which answer might do that, look at the rules, and see which ones causes the most things to happen.
I’d say it’s rule 4: placing R second eliminates U. That does two things:
- We know R is second.
- We can’t have U, so instead we have QT, R and S.
Let’s try drawing that:
So, R is second. Next we must place the biggest block, QT:
Finally, there’s only one space left for S, 1st:
So that proves that placing R second determines everything. B is CORRECT.
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