The next day I was lying in bed and found an envelope under my pillow . I had to go on a scavenger hunt around the city to get all my presents ! It was so fun . I got so many things I wanted .

Pick from:
[a]. The envelope was left for them by the city sanitation department .
[b]. The envelope was left by the narrator 's significant other .
[c]. The envelope was left by her boss so she would be early the next day .
[d]. The envelope was left by an old friend trying to hunt her down .
Answer the following question: Who left the envelope for the narrator ?
[b].