The purpose of employing CPR to a person who has sudden cardiac arrest is to

The purpose of employing CPR to a person
  who has sudden cardiac arrest is to
 
  a. restart their heart.
  b. ensure an oxygen supply to their brain.
  c. keep their lungs inflated.
  d. restart their heart and ensure an oxygen
  supply to their brain.
  e. restart their heart and keep their lungs
  inflated

Question 2

The chances of surviving sudden cardiac arrest
  increases by ___ percent when the affected
  person receives CPR within ___ to ___
  minutes after the event.
 
  a. 100--10--15
  b. 50--4--6
  c. 50--10--15
  d. 100--4--6
  e. 50--40--60