A 76-year-old female with a history of coronary artery disease and prior inferior wall myocardial infarction presents with gradual onset of increased shortness of breath on exertion and lower-extremity swelling. Her physical examination reveals a IV/VI holosystolic murmur at the 5th intercostal space at the mid-clavicular line. Which of the following is likely the cause of her symptoms?
A. Tricuspid valve regurgitation
B. Mitral valve regurgitation
C. Ventricular septal defect
D. Mitral valve stenosis
E. Left ventricular aneurysm