Isaac is giving a speech on influenza vaccinations. During the speech, he says, "Research by Yuri Titov, M.P.H., has shown that in a typical year the vaccine is 70 percent effective at preventing infections, that approximately 60 percent of Americans get vaccinated, and thus there are about 40 percent fewer cases of the flu each year than there would be without the vaccine." Isaac has
A. established the source's credibility through the use of statistics.
B. not established his source's credibility.
C. established the source's credibility by mentioning the author's educational qualifications.
D. established the source's credibility by showing the source is affiliated with a trusted organization.
Answer: C
Communication & Mass Media
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