Arianne recently traveled abroad where she enjoyed eating food from different countries and learning about different cultures. A week after she returned home, she checked into the hospital with signs of nausea, fever, and diarrhea. What best explains what happened to Arianne?
A. A parasitic bacteria contaminated her food.
B. A mutualistic bacteria infected her digestive system.
C. A commensalistic organism is now living in her intestine.
D. A predatorial organism is consuming her natural bacteria.