Which developmental theory is most often used to assess identity status across the lifespan?

A. Rogers' humanistic theory focuses on self-concept and unconditional positive regard but does not specifically address identity development across the lifespan. B. Maslow's hierarchy of needs outlines a motivational model but is not primarily used to assess identity status. C. Piaget's cognitive theory explains how thinking develops over time but is not focused on identity formation. D. Erickson's theory of psychosocial development is correct. It outlines eight stages across the lifespan, with identity development (especially in adolescence) being a key component.