Which of the following options correctly represents the heart conditions in heart failure and heart attack, respectively? 

• A

  The heart stops beating; heart muscle is suddenly damaged by an inadequate blood supply

• B

  The heart is not pumping blood effectively; the heart stops beating

• C

  The heart is not pumping blood effectively; heart muscle is suddenly damaged by an inadequate blood supply

• D

  Acute chest pain when not enough oxygen is reaching the heart muscle; the heart stops beating