She needs to improve her cardiovascular ability
The answer to this question can be figured out by deducing the gist of the options given. A quick scan of the choices would land our eyes to antibiotics - a term we all, perhaps, have already encountered in times when we needed to fight sickness. Despite being a pathogen, antibiotics serve as "beneficial bacteria" since it helps fight off the harmful ones.
ANSWER: C. Antibiotics
It can help relieve depression etc
with out using drugs
