Final answer:
Adolescents in identity diffusion have the greatest difficulty establishing their sense of identity, leading to role confusion and a weak sense of self.
Step-by-step explanation:
The adolescent expected to have the greatest difficulty establishing a sense of identity would be d. One in identity diffusion. Identity diffusion is a status where an adolescent does not have a firm commitment to any goals or values and does not appear to be actively trying to develop them. This state of apathy or lack of direction can lead to role confusion and a weak sense of self, making it difficult for adolescents to navigate the challenges of adolescence and transition into a cohesive adult identity. In contrast, adolescents in identity achievement have found their sense of identity, those in identity foreclosure have committed to an identity without exploration, and those in identity moratorium are in the process of exploring but have not yet committed.