When Auscultating the Tricuspid Area,you Hear a Split S₁

When auscultating the tricuspid area,you hear a split S₁.You determine that the split is wider than usual during inspiration and is still heard during expiration.An abnormally split S₁ is commonly heard in mitral stenosis because the

A) tricuspid valve closes before the mitral valve.
B) mitral valve closes before the tricuspid valve.
C) mitral valve causes a longer and louder sound as it closes.
D) mitral valve causes a loud sound as it opens.

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