The nursing problem of activity Intolerance related to impaired ventricular function is made for a client with myocarditis. Which expected outcome in the plan of care would best reflect a resolution of this issue? The client will:

A. A significant increase in systolic blood pressure during activity may indicate cardiovascular stress, not resolution. B. Severe shortness of breath after minimal activity indicates worsening intolerance. C. Weight loss may reflect fluid loss but does not directly measure activity tolerance. D. Ability to ambulate multiple times daily without shortness of breath directly reflects improved activity tolerance and ventricular function.