Answer: a) Absence of adventitious breath sounds
Explanation: Pulmonary edema is the health condition that happens due to extra lung fluid which lead to issue in breathing. The patient has pulmonary edema which has connection with heart failure. Effective treatment will be indicated by elimination of the abnormal breath sounds over the lungs of the patient.
So, the client can breathe normally .Other options are incorrect because non-productive cough is dry cough which not a good sign of treatment, respiratory rate should be normal and not less as it indicates abnormality .SaO2 86% air in the room is not relevant with the situation.Thus, the correct option is option(a)