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 ?
Option 0: Because it flooded the room .
Option 1: Because the writer 's carpet stinks .
Option 2: None of the above choices .
Option 3: Because the writer fixed the drain themselves .
Answer: 2