The nurse is teaching a male adolescent recently diagnosed with type 1 diabetes mellitus (DM) about self-injecting insulin. Which approach is best for the nurse to use to evaluate the effectiveness of the teaching?

A: Return demonstration is the most effective way to evaluate learning for a psychomotor skill like insulin injection. Observing the adolescent perform the procedure ensures he can correctly and safely self-administer insulin, which directly evaluates the effectiveness of teaching. B: Reviewing glycosylated hemoglobin levels 3 months later will not assess the immediate effectiveness of the teaching or the adolescent’s ability to perform insulin injections. C: Listing steps assesses cognitive understanding, but does not verify the psychomotor skill, which is critical. D: Asking about comfort level is important for emotional support but does not directly assess the technical competency required for insulin administration.