The correct answer is C. Love that is forbidden by society
Step-by-step explanation:
A theme refers to a broad idea that the author wants to show through different elements in a story, this includes characters, events, symbols, among others. Besides this, you can identify a theme because it often states an idea about aspects such as life, love, hope, family, etc. According to this, the clearest example of a theme is "Love that is forbidden by society" because this describes a broad idea about love the author can convey through the story. Also, option A refers to a symbol, option B refers to a specific event in a story, and option D is just a summary.