6. Which of the following is the cause of mitral regurgitation in the setting of hypertrophic obstructive cardiomyopathy?

A. Myocardial disarray of the papillary muscles causing dysfunction

B. Systolic anterior motion of the mitral valve leaflet into the left ventricular outflow tract

C. Mitral annular dilation causing functional mitral regurgitation

D. Mitral valve leaflet degeneration from the increased hemodynamic stress present in HOCM