7. How do the heart sounds and murmur of mild mitral stenosis differ from that of severe mitral stenosis?

A. Mild mitral stenosis has a loud S1 heart sound, whereas severe mitral stenosis has a soft or absent S1 heart sound

B. The opening snap in severe mitral stenosis occurs later in diastole compared with the opening snap in mild mitral stenosis

C. The murmur of severe mitral stenosis is longer in duration than the murmur of mild mitral stenosis

D. The murmur of severe mitral stenosis is more likely to have a presystolic accentuation than that of mild mitral stenosis

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