Final answer:
The special task of achieving a sense of identity is associated with the stage of adolescence according to Erikson's psychosocial theory of development.
Step-by-step explanation:
The special task of achieving a sense of identity is associated with the stage of adolescence according to Erikson's psychosocial theory of development. This stage is called identity versus role confusion and occurs during ages 12-18.
During adolescence, individuals are focused on developing a strong sense of self and answering questions such as 'Who am I?' and 'What do I want to do with my life?'. Successful completion of this stage leads to a strong sense of identity and the ability to remain true to one's beliefs and values.