Answer:
The correct option is 4) The author uses it to foreshadow the friendship at the end of the story.
Step-by-step explanation:
After the conflicts escalates during the climax of the story and is resolved as the story concludes, it has given Colin a chance to know who his true friends are in the light of events that transpired. This way, the author provides a "happy ending" that a majority of the readers crave.