The most accurate answer is:
a Marco because the United States isn't one of the healthiest 30 nations ranked by WHO.
While the United States does have significant medical advancements and high healthcare spending, it faces challenges such as higher rates of chronic diseases, obesity, and overall life expectancy that are lower than in many other developed countries. The World Health Organization (WHO) rankings often consider various health metrics, and the U.S. typically does not place highly in these rankings compared to other nations.