Final answer:
A therapeutic response to pneumonia treatment is indicated by a normal respiratory rate of 20 with no dyspnea and a moderate amount of thick white sputum, reflecting improvement in breathing and infection resolution.
Step-by-step explanation:
The nurse is caring for a patient with pneumonia, and an observation that would indicate a therapeutic response to the treatment would typically be a reduction in symptoms such as fever, dyspnea (shortness of breath), and the productivity of a healthier-looking sputum. The option that suggests the most therapeutic response is a respiratory rate of 20 with no reports of dyspnea and a moderate amount of thick white sputum, since this indicates the patient is breathing at a normal rate and is not experiencing difficulty breathing. A sputum transition from green to white can signify that the infection may be resolving, and the absence of dyspnea further indicates improvement.