What is an appropriate summary for this article? a most troublesome element
a. the cause of napoleon bonaparte’s death was believed to be stomach cancer, but later historians suggested that he could have died of arsenic poisoning.
b. many countries are at a risk of arsenic poisoning, as groundwater in those countries is contaminated with arsenic. people can also be exposed to dangerous levels of arsenic if they inhale the sawdust from the wood
.c. arsenic is a naturally occurring, poisonous element that has threatened the health of humans since the middle ages