The correct answer is D. Flashback
Step-by-step explanation:
In literature, a flashback occurs as the author, narrator or one of the characters refers to events or experiences that occurred in the past, usually because these are relevant. This type of literary element is the one in the passage presented because, in this, the narrator describes events related to his friends and the way we spent time during childhood which is part of the past. Also, the narrator clarifies this by using the past tense to describe the events as in "There was a group of boys around my age that lived in the same complex" that show the reader the narrator is remembering experiences from the past.