If these are your only options and you HAVE to choose 6, here are the answers.
If you can choose less than 6, I suggest only the first 4-5.
1. Adopt a Healthy Lifestyle
2. Keep your immune system healthy
3. Practice good hygiene
4. Get vaccinations
5. Preventative screenings and Self-examinations
6. Genetic Testing
All options are correct EXCEPT "eating fast food".