How does National Geographic allow subjectivity and bias to appear in its
video about the flu?

A. It uses ominous music and a blue filter to make the video more
frightening.

B. It uses the testimonial of a doctor who feels very strongly that all
Americans should be vaccinated,

C. It includes an advertisement for an over-the-counter flu
medication.

D. It uses second-person narration to make the viewer feel guilty for
not getting a flu shot.