The answer should be: D. AED training
Automated electronic defibrillator use is easy, but in actual medical practice, there is only a few pattern of heart rhythm that was shockable. AED can be available in many places but trained personnel might not present when it was needed.
When AED used by someone without training, the helper can be protected by Good Samaritan Law. But their help might worsen the patient condition.
Mary should ask herself the final question; “how can I talk to my friend about how this is making me feel”.
I would not suggest it. Anything can happen on a boat.
i believe wait training can be for everyone because everybody should have the chance to lose weight and be fit , especially if its causing health issues