This question places W immediately before X. That rearranges the ordering rules:
Nobody but U can go after X. So in this question, WX and U fill the final three spots:
I put a dividing line in the middle to make clear which side the floating variables go on. Though on my own sheet I just drew the blocks a bit further apart. I find these floating variables the easiest way to visualize who can go where. No need to draw five separate scenarios – this one diagrams lets you see them all in your head.
A doesn’t work because U can only go before WX or after, so U can only be fourth or sixth.
B doesn’t work because V is before Z. Since Z is third at the latest in this scenario, V can only go first or second.
C doesn’t work because W has to go in the final three slots in this scenario.
D is CORRECT. This diagram proves it:
I filled in only the first half in order to emphasize how you should view these diagrams. This is a “could be true” question, so you just have to show that an ordering is possible.
You don’t have to prove everything, or even finish the scenario, since you know that any order for 4-6 is legal as long as it fits the constraints we set up for this question. WXU or UWX are both fine.
E is wrong because Z has to go in slots 1-3 for this question.
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