The anser would be letter B
I'm not entirely sure but I think this is true (?) because rescue breathing should only be used if any of the following happened to the victim: drowning, drug overdose, collapse due to breathing problems, an unresponsiveness in infants or children, an unconsciousness adult that isn't breathing normally, and if they are having prolonged cardiac arrest.
Hope this helps! :)
Answer:
The first step would be to plan out your excersises and start gradually, never rush yourself into a daily personal fitness plan. And make sure you stick to your plan, if you miss a day or too, DON'T GIVE UP!