A nurse is collecting data from a client who has mitral stenosis. Which of the following findings is a manifestation of this condition?

A. Dyspnea on exertion is the most common early manifestation of mitral stenosis, caused by pulmonary congestion from impaired left atrial emptying. B. Cyanosis can occur in late stages but is not an early or primary manifestation. C. An S3 heart sound is associated with heart failure and rapid ventricular filling, not specifically with mitral stenosis. D. An S4 heart sound is linked to conditions causing decreased ventricular compliance, such as hypertension, but is not typical of mitral stenosis.