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?

Observe him as he demonstrates the self-injection technique to another diabetic adolescent.

Review his glycosylated hemoglobin level 3 months after the teaching session.

Have the adolescent list the procedural step for safe insulin administration.

Ask the adolescent to describe his level of comfort with injecting himself with insulin.