The answer is: 3. He shows a range of emotions, including guilt.
A round character is behaves in a realistic way and grows in complexity within the story. In Act 3, Scene 3 from "Hamlet," Claudius is able to reveal his bad conscience after killing his own brother to become king. Thus, he exclaims his soul is as black as death and that his guilt cannot leave his soul. He even asks angels to help him get rid of his sin, so that his heart can become soft again.
