The human body is made up of several organ systems that work as a unit to allow the body to function properly. When the body is invaded by the E. coli bacteria from ingesting undercooked meat, a person will likely experience diarrhea, nausea, and vomiting. Which of the following system failed to do its job? (I’ll give brainliest)

A. Digestive System
B. Excretory System
C. Nervous System
D. Immune System