A nurse is providing teaching for a parent of a preschool-aged child who had a myringotomy with a tympanoplasty tube insertion 4 days ago. Which of the following actions should the nurse identify as an indication that the teaching was effective?

A. The parent applying prescribed medication as instructed indicates proper understanding of post-operative care and adherence to treatment. B. Allowing the child to lift their older sibling above the ground is inappropriate as it can lead to increased pressure on the ear, risking complications. C. Enforcing nose blowing only when necessary is a correct action since excessive force can displace the tympanoplasty tube or introduce bacteria into the ear. D. Planning to have the child use ear plugs in the shower is an effective precaution to protect the ears from water exposure, which is essential post-surgery. E. Reporting purulent drainage immediately to the surgeon shows awareness of potential complications and the need for prompt medical attention.