Why is a chronological structure effective for an argument about how Jenner helped spread immunization?

A chronological structure presents events in the order they happened. For an argument about how Jenner helped spread immunization, tracing smallpox’s history from its beginning through its eradication gives a timeline that shows how events unfolded. Choice C describes that full historical timeline; the other choices focus too narrowly on Jenner or make a claim about what the text explains.

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