How does the author's use of chronology help support the idea that the BSE epidemic was a watershed moment, or turning point, in government use of law to support public health?

The author lays out a timeline to show how scientific discoveries made governments less likely to make laws for public health.
The author makes it clear that prions were always known to be dangerous and that scientists discovered them to be the cause of mad cow disease.
The author discusses how the mad cow disease epidemic ended only about twenty-five years after it first became a problem.
The author shows how frustrated people were that nothing was done about a disease until over ten years after it was discovered.