Budhia,57 yrs,presents with severe myxomatous mitral regurgitation is asymptomatic,with a left ventricular ejection fraction of 45% and an end-systolic diameter index of 2.9cm/m2.The most appropriate treatment is:

• A. ACE inhibitor therapy.
• B. Digoxin and diuretic therapy.
• C. Mitral valve repair or replacement.
• D. No treatment.