What Natural Occuring, Organic Antibiotic Would Be Most Effective Against E. Coli??

During biology; Honey, Tea tree oil, Cranberries, and Lemon juice were tested on E. Coli. (The E. Coli was spread on the agar plate). There is much conflicting information about cranberries about whether they really help get rid of E. Coli or help the growth of it. By the experiment it appears that honey was the most effective. Why is that?? What is it within the honey that fights the E. Coli?? An organelle, an antibody??