My dog had a heart attack tonight . He died within minutes of mom taking him to the animal emergency room . I was on my way to meet her there . I did n't get there in time .

Generate a question about the above context.
Why is the narrator likely crying and downtrodden ?
Select from the following.
[+] Their mom is dead ..
[+] None of the above choices ..
[+] Their pet passed away ..
[+] Their mom passed away ..