Final answer:
Wheezing and the difficulty to speak in full sentences best define the diagnosis of ineffective airway clearance in an asthma patient, as these symptoms directly relate to the inflammation and constriction of the bronchial tree.
Step-by-step explanation:
The best defining characteristics to support the diagnosis of ineffective airway clearance related to inflammation and constriction of the bronchial tree in an adult patient with asthma would be c. Wheezing and difficulty speaking in full sentences. These symptoms are indicative of the narrowing and obstruction of the airways due to inflammation (thickening of the airway walls) and tightening of the muscles around them. Additionally, during an asthma attack, excessive mucus production often occurs, further obstructing the airways and impeding the ability to breathe normally and speak without interruption.