Answer:
"Be careful, because the floor is wet," he warned.
Explanation:
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.
Answer:
The last sentence
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