You read the following paragraph in an article that will be submitted to an academic journal.
"Preventing unhealthy behaviors is the best method for lowering the prevalence of chronic diseases. For example, smoking causes lung cancer. Alcohol use causes heart disease. Poor diet and exercise cause obesity, and obesity is a known cause of diabetes. Preventing the disease requires preventing the behavior."

The author of this paragraph most likely:
O did nothing wrong. The paragraph looks fine.
O collected data themselves so they could make those statements without using references.
O realized that citations were not needed. because the information is considered common knowledge.
O committed some type of plagiarism because there are no references associated with those facts.