Final answer:
C. Egocentrism has three key elements: imaginary audience, personal fable, and heightened self-consciousness.
Step-by-step explanation:
According to Piaget's theory of cognitive development, egocentrism is a characteristic of adolescence. It involves a heightened self-consciousness and a tendency to believe that others are as preoccupied with one's own appearance and thoughts as oneself. Egocentrism has three key elements: imaginary audience, personal fable, and heightened self-consciousness. The personal fable is one of the key elements of egocentrism, which refers to an adolescent's belief that their experiences and feelings are unique and no one else can understand them.