B). Using improper body piercing methods
Using improper piercing (and tattooing) methods can lead to serious infection along with not taking proper care of the pierced area.
Explanation:
How Age and Exercise Affect Your Max Heart Rate. The relationship between the heart and exercise has been studied for more than six decades and the research is clear: Max heart rate—the highest heart rate you can safely hit during exercise—decreases with age regardless of lifestyle or level of fitness.
A professor of microbiology.
