Why is a chronological structure effective for an argument about how Jenner helped spread immunization?
because the text shows how Jenner was involved with smallpox from its beginning to its end
because the text helps explain why Jenner is known for eradicating smallpox all over the world
because the text follows the history of smallpox from its beginning to its eradication, or end
because the text focuses on only Jenner's work

c. because the text follows the history of smallpox from its beginning to its eradication, or end

Explanation:

The text is organized in chronological order, going from when smallpox first started to when vaccination replaced variolation. The beginning helps provide evidence and support for how Jenner helped to spread immunization.

c on edge2020

Explanation:

because the text follows the history of smallpox from its beginning to its eradication , or end

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third person

explanation:

note the usage of names and pronouns, "james" & "the old man". this alone can confirm it as third person, as first person uses "i" and the like, while second person uses "you" and the like.

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killed them

explanation: