I would say that the literary device being used it imagery
Moony is Remus Lupin, wormtail is Peter Pettigrew, padfoot is Sirius Black, and prongs is James Potter. They gave each other these names during their Hogwarts years, causing mayhem wherever they went.
The answer is 2 because they are not meaning it in a violent way so it's not 1, there is no sign of disinterest so it's not 4, and it's not talking about acceptance so it can't bring 3. Therefore the answer is 2.
This is a sentence, it is complete.