Please help! How does the author of "Edward Jenner and the History of Smallpox and Vaccination” support the claim that the World Health Organization achieved its goal to eliminate smallpox?

A.)by providing information about revaccination and mortality

B.)by giving details about the World Health Assembly report in 1958

C.)by quoting the World Health Assembly’s announcement in 1980

D.)by stating that the group had a global campaign

i would have to say "a" or "d".

ian mortimer in his book "the time traveller's guide to elizabethan england" uses a narrative in his style, which successfully conveys a clear description of the life in england in the 16th century. he writes in second person, which makes it comfortable to reader and easy to understand, he captures the readers attention with views of the landscape, the streets, the people including rich and poor. he also depicts some cultural traits from how people behave, eat or what they wear. his descriptions range from the social, economical, the political power to the examples of the life of common people. it could be tell that this book is about social history rather than a   novel.