No, I don't think it is a rhetorical device
The answer would be A: A labeled diagram of a car engine. This would show the viewers what each part is and where it goes in order to rebuild the engine.
The poem the Cremation of Sam Mcgee would not be a poem if it did not rhyme.
Poetry requires rhyme. It is the art of rhyming that makes any piece of poetry valuable. Beyond this, without rhyme the listeners would be less interested in the story as one of the main assests of this creation is its use of rhyming structure to keep us hooked on the tale.
King Solomon built a temple to God by honoring the commitment made by his father King David.