Letitia believes the United States is one of the healthiest countries in the world. Marco disagrees. Who is right and why?

A. Marco because the United States isn’t one of the healthiest 30 nations ranked by WHO.
B. Marco because the United States is only ranked as the 15th healthiest nation by WHO.
C. Letitia because the United States provides free health care to all its citizens.
D. Letitia because the United States has the highest life expectancy in the world.

The correct answer is B. Marco because the United States is only ranked as the 15th healthiest nation by WHO. The World Health Organization (WHO) ranks countries based on various health indicators, such as life expectancy, access to healthcare, and other factors. Since the United States is ranked as the 15th healthiest nation by WHO, it suggests that there are at least 14 other countries that have better health outcomes and overall health systems. Therefore, Marco's disagreement is valid. C is incorrect because the statement about free healthcare is not accurate, as the United States does not provide free healthcare to all its citizens. D is also incorrect because the statement about the United States having the highest life expectancy in the world is not accurate.