Which would be the best question to ask after reading paragraph 6? what other famous people have been poisoned by arsenic? how can a person test for arsenic in their drinking water? how did the ground water in these countries become contaminated? nextreset

If this was the missing paragraph 6:
"The details of Napoleon's death are unclear. However, there is no question that people today are getting ill and dying from arsenic poisoning. Arsenic compounds occur naturally in the earth's makeup. Contamination of ground water has been found in many countries, including Argentina, Chile, China, India, Mexico, Taiwan, Thailand, and even the United States. It is a global problem." 

The best question to ask after reading paragraph 6 is:
How did the ground water in these countries become contaminated? 

It is the best question because the contamination has already reached numerous countries and it should be stopped before it becomes a bigger global problem by contaminating other countries.