Final answer:
The best etiology to support the nursing diagnosis of ineffective airway clearance is inflammation and constriction of the bronchial tree.
Step-by-step explanation:
The best etiology to support the nursing diagnosis of ineffective airway clearance in this case is inflammation and constriction of the bronchial tree (c).
Bronchitis is an inflammation of the bronchi, which causes redness, swelling, and a build-up of mucus in the air passages. This can lead to a narrowing of the airway, making it difficult for air to pass through and resulting in ineffective airway clearance. Rhonchi, which are rattling sounds heard during breathing, also indicate the presence of mucus and obstruction in the airway. Peripheral edema, or swelling in the extremities, is likely caused by congestive heart failure, which can contribute to the ineffective airway clearance.