I would say there are three correct answers: exaggerated character behavior, an improbable, absurd storyline, and over-the-top dialogue.
Every character in the play is exaggerated, meaning that they are exhibiting behavior unlike actual human beings. The storyline is improbable because the characters are constantly fighting (99% of the time) and the only time they stop fighting is when they have to kiss to get married. The dialogues are also over-the-top and absurd.
