Answer: the answer is actually D not C so yea its D
Athletes Foot- Wash your body regularly. Gum Disease- Floss Regularly. Cold Sores- Do not share lip gloss
1. eating healthy foods.
2. getting enough sleep.
3. getting enough exercise
4. managing stress
5. washing your hands consistently.
All of those things helps your immune system by strengthening it or by keeping germs away which intern helps prevent you from getting sick.
I hope this helps. Let know if anything is unclear.
Smooth and skeletal is the answer yuh