Respuesta :
I believe the answer would be the first choice: Brush and Floss his teeth regularly to avoid gum disease and cavities because the word avoid is similarly related to prevent. he is partaking in those actions so he can prevent what happens if you don't. hope it helps.
The correct answer is A.
By brushing and flossing his teeth regularly to avoid gum disease and cavities he is using a method of prevention in regards to his personal health. Brushing and flossing are activities of personal hygiene related to health. The other activities will not enforce prevention.