Answer: Identity versus role development stage.
Explanation:
Identity versus Role confusion or Identity versus Role diffusion stage is the time in which adolescents are conflicted with dozens of values and ideas concerning who they should be and what they should think or do. It is characterized by the question "who am I".
Since Robert is sullen and doesn't know where he fits in, in the society it is going to be hard for him to resole this development stage and to answer this very important question of " who he is" because that is when he can actually know where he falls or where he belongs to in the society.
