I'm pretty sure it's to boost dental health. fluoride is used to prevent cavities and tooth decay, so i'm assuming its option 3.
Answer:
Gram stain
Explanation:
This is the method of staining used to classify bacteria species into two larger groups.
The most important lifestyle choice you can make to improve physical fitness is B. participating in regular exercise.
This is because unlike the other options, regular exercise improves your physical fitness as well as your overall health and is beneficial towards all parts of the body. Regular exercise results in a healthful body weight, helping you to stay in shape. Additionally, to achieve good physical fitness, you must also eat a nutritious and balanced diet.
Hope this helps!