Write a letter to your friend describing your family

Based on your knowledge of word parts what does the word intervene mean

Aman lives on the twelfth floor of an apartment building. every morning he takes the elevator down to the lobby and leaves the building. in the evening, he gets into the elevator, and, if there is someone else in the elevator -- or if it was raining that day -- he goes back to his floor directly. otherwise, he goes to the tenth floor and walks up two flights of stairs to his apartment.

Which. sentence from homesick best shows that the narrator is a character in the story