Answer:
the first great awakening
The best answer is a. A flashback is usually used to depict the passage of time.
The article deals with The American Red Cross(Who) that is encouraging people to update on the cardiopulmonary resusitation(What). It tells us that"compression -only " CPR is an alternative when a responder is unwilling or unable to perform complete CPR( when).
Although it describes the procedure it does not really detail <em>how </em>to do it or <em>how</em> the The American Red Cross is planning on encouraging people to switch for this method.
C: Metaphor to compare vitality of life to flame