This question has options. Answer the question about text:

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 ?
Options are:
i. Because it flooded the room .;
ii. Because the writer 's carpet stinks .;
iii. None of the above choices .;
iv. Because the writer fixed the drain themselves .;
iii.