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 .
Why did the writer 's shower drain back up ?
A. Because it flooded the room .
B. Because the writer 's carpet stinks .
C. None of the above choices .
D. Because the writer fixed the drain themselves .


C