Respuesta :
The Author presents a series of interesting, partially related facts to support his argument that smallpox devastated mankind over the centuries.
The option of a Historical Timeline is not correct because only the example of the decline of the Roman Empires states an actual date ( AD 108).
The option of an alternative claim is also incorrect because there is no such a claim.
The option of details of a historical incident seems to be correct but is not because there are several historical events presented and there is not a single detail on them.
So the correct option is the last one interesting, partially related facts.