THE first one is personification because darkness doesn't really talk. Personification means you are giving an inanimate objects or animals the traits of a human. The second one is a simile. A simile is where you use like or as to compare two different things. The last one is a metaphor. A metaphor is comparing one thing to another thing that isnt possible. An example of a metaphor is "You aint nothing but a hound dog crying all day". because you arent actually a hound dog. he is just saying that because you have been crying for a long time. hope this helps.
