Which scenario is the best example of a frame narrative?

a. two star-crossed lovers struggle to express their adoration for each other while their families fight a long-standing feud.

b. a reporter tries to piece together the truth as she listens to three different plane-crash survivors tell their stories.

c. a detective discovers that the kidnapper she's been investigating is actually her other personality.

d. an elf, a human, and a gnome must come together to unite the shards of radaganadar.