As with all list questions, use each rule to eliminate the wrong answers one at a time.
A is wrong because P’s messages have to be before T’s, when F is in (rule 5).
B is wrong. If G is in, F has to be in (rule 4).
C is wrong. If H leaves the first message, P has to leave the last message (rule 3).
D is CORRECT.
E is wrong because H and L both leave two messages . Only one person can do that (rule 1).
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