Context: I could n't think for the life of me what this stuff could be . But I started grabbing clothes and shaking them outside to rid them of as much mystery substance as possible . I was still wracking my brain when , as I shook out another handful of clothes , a diaper flew out .

Question: What may be the reason why a diaper would be in with clothes ?
Options:
0. Because they are messy .
1. Because a diaper somehow got into the laundry to be washed .
2. Because they throw diapers in laundry piles .
3. Because they do n't dispose of diapers properly .
Answer: 1