A 40 year old female presents with dyspnoea on exertion grade III and palpitations.ECG showed atrial fibrillation with fast ventricular rate.Echocardiography shows severe mitral stenosis with left atrial appendage clot.Which of the following is not advised ?

• A. Diltiazen to control ventricular rate
• B. Start warfarin and follw-up with repeat echocardiography
• C. EC followed by percutaneous balloon mitral valvuloplasty
• D. Open mitral commissurotomy with clot removal