Answer: C) The reference to “pennies” reveals the historical context of the story.
Explanation: The setting of a story or a text is the place and time where the story takes place, it can also be the context of the story (political, historical, cultural, etc). In the given excerpt from "A Tree Grows in Brooklyn" by Betty Smith, the reference to "pennies" reveals the historical context of the story, because it established a period of time where the story must have taken place.