The main reason for including the anecdote is D. Stepanek helped others deal with physical challenges.
It should be noted that an anecdote simply means a short or amusing story about an individual or incident.
In this case, the the author's main reason for including the anecdote about Mattie Stepanek is that Stepanek helped others deal with physical challenges. This was vital to the plot in the story.
Learn more about anecdotes on:
https://brainly.com/question/24863956