While Working on a Cell Sample from a Sick Cow,you

Multiple Choice

While working on a cell sample from a sick cow,you notice a number of very small bacteria in the cells.What is the best conclusion about the role of the bacteria in the cow's cells?

A) They developed as a resistance against the disease but were ineffective.
B) They are mycoplasmas that are causing the disease.
C) They are endosymbionts evolving into a new kind of mitochondria.
D) They are neither helping nor hurting the cow.
E) They are actually misidentified mitochondria.