If X is performed first, then Y is performed second. Everything else has to go after Y. (T, O, P and Z)
That means that D is CORRECT.
E is wrong. If we put Y third then there is no space to put T, O, P and Z after Y.
A and B are wrong because there are really no restrictions on who can sing X. Since anyone can sing X, it’s very easy to make the last person different from the first. The last song could be P or Z.
C is doesn’t have to be true. T could go before P: P would be fifth, Z would be sixth.
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