Study the poster showing characters from the movie star wars and created by the us department of health, education, and welfare in 1977.
how does the poster most likely demonstrate the use of the testimonial technique ?
the photograph shows fictional film characters, used to
"sell' immunization,
the text references the health department, a revered
government institution.
the phrase "call your doctor" adds a reference to an
esteemed authority.
the phrase "parents of earth" reminds the audience of
the importance of parenting.