Step 1: Understanding metafiction.
Metafiction refers to fictional writing that self-consciously draws attention to its own status as fiction. It often breaks the illusion of reality by foregrounding the act of writing, reading, or storytelling itself.
Step 2: Analysis of correct options.
Option (B) is metafictional because the reader becomes a character who is aware of the act of reading and interrupts the narrative due to its incompleteness.
Option (D) is metafictional as it explicitly reveals the author within the text, commenting on the construction and future of the fictional character.
Step 3: Eliminating incorrect options.
Option (A) involves multiple narrators but does not reflect self-awareness about fictionality.
Option (C) uses a frame narrative but does not question or expose the fictional process itself.
Step 4: Conclusion.
Metafiction is best represented where the text reflects on its own creation and reception, which occurs in options (B) and (D).
Final Answer: (B) and (D)