Context: So ... yesterday my shower drain backed up and flooded my room . Today my carpet stinks . I fixed the drain myself but my room smells like a mixture of mildew and sewage . It 's still damp , too .

Question: Why did the writer 's shower drain back up ?
Options:
0. Because it flooded the room .
1. Because the writer 's carpet stinks .
2. None of the above choices .
3. Because the writer fixed the drain themselves .
Answer: 2