A 35 year old athlete has height 184 cm.,arm span 194cm.,pulse rate 64/min.,BP 148/64 mmHg.Chest ausultation reveals long diastolic murmur over right 2nd intercostal space on routine examination.The probable diagnosis is:

• A. Aortic regurgitation
• B. Atrial septal defect
• C. Ebstein anomaly
• D. Coarctation of aorta