48 yo F evaluated during a new patient visit. She runs 5 miles a day 5 days a week .2/6 holosystolic murmur that is best heard at apex and radiates toward axilla.Which condition is most likely responsible for the patient's holosystolic murmur?
a) Aortic stenosis
b) Mitral valve prolapse
c) Atrial septal defect
d) Tricuspid regurgitation