The following statement contains some of the events that lead to a 'heart attack'. (i) Blood clot that breaks, loose and passes along blood vessel. (ii) Region of heart muscle suffers a myocardial infarction. (iii) Narrow branch of coronary artery becomes blocked by thrombus. (iv) Thrombus forms on inner surface of coronary artery. The correct sequence of these events is:

• A. (i), (iv), (ii), (iii)
• B. (i), (iv), (iii), (ii)
• C. (iv), (i), (ii), (iii)
• D. (iv), (i), (iii), (ii)