Option 1: Bacterial attack on the heart

This option is incorrect. Heart attack, also known as myocardial infarction, is not caused by a bacterial attack on the heart. It is a result of a blockage in the blood vessels that supply oxygen and nutrients to the heart muscle.

Option 2: Stopping of heart beat

This option is incorrect. While the stopping of heart beat can be a life-threatening condition, it is not the cause of a heart attack. A heart attack occurs when there is a lack of blood supply to the heart muscle.

Option 3: Lack of blood supply to the heart itself

This option is the correct answer. A heart attack occurs when there is a blockage in the coronary arteries, which supply blood to the heart. This blockage can be caused by a blood clot or a buildup of fatty deposits, leading to a lack of blood supply and oxygen to the heart muscle.

Option 4: Impairment of heart’s work

This option is not specific enough to describe the cause of a heart attack. While various factors can impair the heart`s work, it is the lack of blood supply to the heart that specifically leads to a heart attack.