Explanation
Answer: d. Improving myocardial oxygenation
Explanation: In clients with CHF, the primary indication for oxygen therapy is to improve myocardial oxygenation and relieve symptoms of myocardial ischemia.
Incorrect choices: a. Reducing the workload of the heart is a potential benefit of oxygen therapy but is not the primary indication in this case.
b. Decreasing peripheral edema is not a direct indication for oxygen therapy.
c. Preventing fluid overload is important in managing CHF but does not directly relate to the need for oxygen therapy.