The bacteria Escherichia coli (E. coli) live in the intestines of humans and make
vitamins such as vitamin K and B-complex vitamins. Which would best describe
the relationship between E. coli and humans?
A. The E. coli benefit and humans are harmed.
B. There is only a benefit for the humans. Got it incorrect on the first try.
C. There is only a benefit for the E. coli.
D. The E. coli and humans both benefit.