Context: It should be interesting . Niels was supposed to come to Metro , but I do n't think he did unless he had come and gone by the time I got there . I did n't work today , but left my car there and walked to campus . If he did n't come today than maybe he 'll be there tomorrow or Friday .

Question: What 's a possible reason the writer did n't work today ?
Options:
0. Because Niels was supposed to come to Metro .
1. Because the writer left their car at work .
2. None of the above choices .
3. Because they are n't scheduled to work .
Answer: 3