Which of the Following Statements Describes the Function of Escherichia

Which of the following statements describes the function of Escherichia coli in the intestine?

A) These organisms feed off undigested food.
B) They synthesize vitamins (e.g., B vitamins) .
C) They produce mucus so that feces will pass.
D) They aid with water absorption.
E) Both these organisms feed off undigested food, and they synthesize vitamins (e.g., B vitamins) .