From the options, I would say it would be option B.
Answer: Lactobacillus
This kind of cell would be considered a friendly cell, a cell that would protect your body. But, it's more into animals then anything else. But, there's all kind of these kind of cells, that's why they can be into any kind of animal and human. Hope this helps.
... increase their chances of displaying this said attribute in higher incidence and frequency
Answer: only one owner
Explanation: I just did the quick check!
