When a question gives you a new rule, you can combine it with the existing rules to make a deduction.
We know Z is after V and before X:
This question also places Z before Y. And we know Y can go third at latest.
So Z is after V, and before Y. That’s three variables. Since Y can’t go later than third, we must place these three variables in slots 1-3:
The question asks about the earliest we can place W. Let’s first look at the remaining variables. W comes before X. U is the only variable left, and the only rule for U is that it goes somewhere 4-6. Here’s how I draw this:
The line between W – X shows that W comes somewhere before X. The comma between W – X and U means that there are no rules governing where you can place U. It could go before W – X, in between them, or after them.
This way of drawing “W – X, U” is a flexible method of visualizing everything that can be true, without clutter.
There is no reason we can’t place W fourth, so C is CORRECT.
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