I swear I even walked backwards for a while cause it did n't hurt so bad . I 'll be fine , its just part of the process . I hope someday I look back after I finish a full marathon and think , geez I was being a big baby after that half .
According to the above context, choose the best option to answer the following question.
Question: Why may the narrator be sore in the coming days .
Options:
A. They just lifted weights .
B. They just got beat up .
C. None of the above choices .
D. They just ran a marathon .


D