If Xiao speaks at 3 pm, then there are three possibilities. They depend on where ML speak. The third rule says that if ML are in the Gold room, then X is in the Rose room:
If ML are in the Rose room, then X could speak in either room. In both scenarios, ZY must be first in their room:
The three diagrams prove that A is CORRECT. Long can’t be in the same room as Yoshida in any scenario.
All of the other answers are possible in one or more diagrams.
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sab says
Why is Y always before X?
TutorLucas (LSAT Hacks) says
This question is asking us what happens if X’s speech is at 3pm. 3pm is the latest time slot in this game, and only one speaker can speak at that time, so in this scenario Y and all other variables must always be before X.