Virus and bacteria are the suedes that cause it
Yoga
Running
Hiking
Jogging
Walking
Biking
Swimming
CrossFit
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.
D. Removing bones and pits from food
Hope this helps! Good luck. :)