The way it injection or swallowed it still goes to your stomach and in which it's a liquid so it goes to your urine
It should be D or A. !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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.