How does the author use rhetoric to advance the purpose of this passage?

A-
The use of antithesis-placing opposing ideas
together for contrast—in the second paragraph
clarifies that the author agrees with the second view.
B-
The use of short sentences at the end of the second
and third paragraphs contributes to making the
passage informal and reader-friendly.
C-
The use of hypophora—a question followed by an
answer—at the beginning helps the author show that
the passage will contain surprising information
D-
The repetition of "but" in the second sentence helps
the author emphasize that the doctors were ignorant.