Final answer:
In 'Persepolis 2', Marjane Satrapi uses captions to explain historical context, as they offer detailed background and engage readers by providing a variety of perspectives. Therefore, the correct option is b) Explain historical context.
Step-by-step explanation:
In Persepolis 2, the author Marjane Satrapi uses captions primarily to explain historical context. This is evident as the text aims to show readers the why of historical events and people, by providing context to engage students. The captions serve as short statements that give context for each event depicted, helping readers to understand the narrative progression.
Not only do the captions include historical significance, but they also engage readers in the narrative by presenting various perspectives, including those traditionally underrepresented. Satrapi's work exemplifies the strategy of 'showing, not telling' by offering specific scene details to fully immerse the audience in the story with a blend of both textual and graphic images. This approach illustrates to readers an idea, word, or expression, enabling an explanation of a unique meaning of a topic through details and analysis.