When analyzing the novel's theme, you should focus on the scenes that reveal the main character's relationship to others (Second option) because it is usually this kind of scenes that repeat a particular topic that when it is repetitive, might be the theme of the novel.
The theme is the message or the main idea of the novel, it is usually about life, society, the human condition, among others. When analyzing a novel's theme you should also ask yourself some questions like the following:
- Are there elements repeated that might be the theme?
- How is the theme highlight in the story?