In order for her to make that statement, she would have to run a proper experiment. She would have to have a control and a treatment group where everything is equal except for the treatment group has the treatment. So if she had two Petri dishes that were kept in the same conditions with the same lighting, the same air, the same material that the bacteria is growing on, everything the same, except for the treatment group has the antibiotic applied to it, and then she saw that in the treatment group that most of the bacteria died while in the control group most of the bacteria didn't die, then she could say, okay, it looks like the antibiotic caused the bacteria to die, that there was actual causality here. So she would have had to run an experiment. The most appropriate statistical study, or the most appropriate study would have been a proper controlled experiment where you have a control group where they don't have the antibiotic and a treatment group where they do have the antibiotic. So let's see what are the choices here where they say is the study appropriate. So yes, because she's in a proper study, no, I don't like that answer.