Staph infections caused by the bacterium staphylococcus aureus are increasing in frequency and are more difficult to treat with antibiotics. many staph infections are now caused by mrsa and methicillin resistant strain of s. aureus. what explains the more widespread phenomenon of mrsa prevalence in staph infections?

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.

bacterium is not correct

if you listed your answers right then i believe your answer is b.