Answer:
The best answer to the question: The most likely reason this passage was included at the end of the narrative is because the narrator is:___, would be: Because he seems to be reflecting on an experience that he probably had, one that really marked him.
Step-by-step explanation:
One of the first clues about the answer above being the most likely reason is the use of the sentence: "When I talk about the experience now..." This sentence allows us to realize that there has been something in this person´s life, an experience, that has marked him/her significantly, and also, the way that the excerpt develops later, shows the reflection on the event. Basically we see how the person reflects on the before, and the after, of a marking event, which was an accident. This is why the answer above is the best one.