Dramatic irony means that the audience knows something the characters do not. For example, in the beginning of Hamlet, we know immediately that Claudius was the one who killed Hamlet's father, however, he doesn't know that from the very start.
Since <em>contrast</em> in short means to compare,
A. would be the best answer, since it compares the qualities of a dog to a cat.
Hope I helped!
It’s operation. Hope this helps
