Answer:
The last sentence
Step-by-step explanation:
I do not know if I'm right but I think it's the last one because it's the only one that tells us who it was or what it was that warned us that it's flat was wet
"Be careful, because the floor is wet," he warned.
This is correct because if you add a period after the word wet, it shows that the sentence is over and does not connect with he warned.
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