You know what they say ... " NO play makes slay gray . " OK I do n't think THEY say that , maybe its more like " No play makes slay even meaner . " Yeah I think that 's it . So I am looking at this cache , waiting to see who would find it first , checking it periodically during the day ... And no one claims it .
According to the above context, choose the best option to answer the following question.
Question: What 's the likely reason that the narrator keeps checking on something ?
Options:
- Out of curiosity .
 - Out of boredom .
 - He feels gray .
 - He 's mean .


Out of curiosity .