Answer:
Well first of all, you should always call 911 and start chest compression's first, and should only administer a rescue breath if you are trained in CPR. But, I think the correct answer might be A)Repeat the head-tilt-chin-lift maneuver and attempt the breath again.
Explanation:
Every article I have read suggests that you should administer at least 2 rescue breaths because sometimes the first breath doesn't make the chest rise.
