Which Would Be More Likely to Cause Illness-A Water Sample

Which would be more likely to cause illness-a water sample that tested positive for coliforms or one that tested positive for

A) Both would be equally capable of causing illness-all coliforms cause illness.
B) The coliform positive sample would be more likely to cause illness. Coliforms are inherently more pathogenic than the weak O157:H7 lab strain of E. coli.
C) The E. coli O157:H7 sample would be more likely to cause illness. This strain of bacterium is highly pathogenic and capable of causing kidney damage.
D) Neither-there is usually a small amount of coliforms (including E. coli O157:H7) in all water.