If there are no interviews on Wednesday and Monday morning then hostile witnesses must be interviewed on Friday and Saturday. Note that no interviews mean no interviews of any type; no hostiles and no non-hostiles.
There is not much we can say about the order of U, QR and Y. We know Y is before X. Z has to go on Thursday, because Friday and Saturday are full of hostile witness interviews.
A is wrong because Q could be interviewed on Wednesday morning while U could be interviewed on Tuesday.
B is wrong because Y could be interviewed on Wednesday morning.
C is wrong because Y could be interviewed after U, on Wednesday morning.
D is wrong because Y could be interviewed on Wednesday morning, and U-QR could go in the two spaces on Tuesday.
E is CORRECT. Z has to go before Friday because Friday and Saturday are full on non hostile witnesses.
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