Final answer:
Frequent hearing tests are recommended after cleft lip surgery because the surgery can affect the function of the middle ear, potentially leading to hearing issues.
Step-by-step explanation:
The nurse emphasizes the need for frequent hearing tests for Maria, who has undergone cleft lip surgery, as a part of her long-term health maintenance. Surgical repair of cleft palate or cleft lip is known to impact more than just appearance. It can also affect the function of the middle ear due to altered anatomy and function of the eustachian tube, leading to potential hearing issues. Therefore, option A, 'Cleft lip surgery may affect hearing,' provides the rationale supporting this nursing intervention. Frequent hearing tests are crucial to monitor and manage any hearing problems that may develop as a result of the anatomical changes caused by both conditions.