Read the following context and choose the best option to answer the question.
Context: It was only here that I felt I was doing well . I was outpacing people , even men , and I enjoyed every minute of it . Time passed by quickly here ; well , it was just 3.4 km after all .
Question: What may be the reason why she is running ?
Options: 
- She is at home .
 - None of the above choices .
 - She is in a marathon .
 - She is at the gym .


She is in a marathon .