Answer
b. Normal biota
Work Step by Step
Since E. Coli is a normal biota, which is present in water and food garbage, the most likely interpretation will be normal biota. Thus, the correct answer is option b.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.