For a could be true question, you can eliminate answer choices by asking: does this have to be false?
A can’t be true because R, T and V must come before Y.
B can’t be true because only Z can go before R.
C can’t be true because R, T, V and Z must go before Q.
D could be true. S could be fifth if Z, Y and Q went after S. D is CORRECT.
E can’t be true because S, Y and Q all have to come after V.
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