Final answer:
Forming an adult identity is crucial because it aids an individual in coping with life's demands and establishing mature relationships. Through the development of a firm sense of self, one can achieve personal satisfaction and contribute meaningfully to society.
Step-by-step explanation:
The importance of forming an adult identity lies in its role in helping an individual cope with the demands of life and establish mature relationships. Option a) correctly states that it enables the individual to cope well with the demands of life and to form adult relationships. As adolescents transition to adulthood, they face the task of figuring out who they are and where they fit into the world. This process involves exploring various roles and beliefs, setting personal goals, and understanding one's values. A well-formed adult identity is crucial for personal satisfaction and is foundational for engaging in healthy romantic relationships, choosing a vocation, and becoming a contributing member of society. The options b), to win at competitive sports, c), to become a celebrity, and d), to master every skill and talent, are not directly related to the core purposes of developing an adult identity.