A is inCORRECT. There are no rules about O. We could put O in day 1, S in day 2, M in day 3 and R in day 4.
B is CORRECT. If you put S in day 3 then J, a nurse, has to go there. But L, a nurse, is already in day 3.
C can be tricky to eliminate if you forget the Leopold can go twice. They have to go on day 3 but can go on day 1 as well.
D and E are wrong because there are no rules about Vitale or Wong. It’s very easy to put them anywhere.
This diagram proves both D and E could be true:
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