Which of the following is a component of self-concept?

A. Blood pressure regulation is a physiological function and not part of self-concept. B. Respiratory effort pertains to physical health status, not one's perception of self. C. Digestion is a bodily process and unrelated to self-concept. D. Role performance refers to how individuals perceive their ability to carry out expected social roles (e.g., parent, student, employee), which is a key component of self-concept.