Which line from the excerpt employs imagery in the form of a metaphor? oh, she does teach the torches to burn bright! so shows a snowy dove trooping with crows as yonder lady over other ladies shows. like a rich jewel in someone’s ear for i never saw true beauty till this night

The answer is : Oh, she does teach the torches to burn bright!
Metaphor is a form of literature technique that contain an implied comparison between a certain meaning with another.
By saying she doth teach the torches to burn bright!, Rome basically saying that Juliet is a source of light, like a star, against the darkness his life.