Answer: D: By focusing on the thoughts and feelings of Quin, the author develops his character the most.
Explanation: The point of view of the story in Quarantine: Chapter 1 is primarily through Quin's perspective. The story is told in the first person, and the reader is privy to Quin's thoughts and feelings throughout the chapter. This allows the author to develop Quin's character in depth and explore his emotions and reactions to his situation.
While the story does include other characters and their perspectives, such as Gwen's, they are presented through Quin's lens, and the focus remains on his experience. Therefore, the effect of the point of view is to develop Quin's character the most.