A 24-year-old woman presents with progressive dyspnea and hemoptysis. Examination reveals a loud S1, opening snap, and mid-diastolic murmur at the apex. Echocardiography shows mitral valve area 0.8 cm² with commissural fusion and no left atrial thrombus. What is the best definitive management?
A
Long-term diuretics alone
B
Percutaneous balloon mitral valvotomy
C
Mitral valve replacement
D
Rate control and anticoagulation only