Which sentence does not contain any errors in comma usage?
a.
she knelt down looked under the bed, and pulled out a single sneaker.
b.
they all wanted the hamster but they couldn't decide what to name it.
c.
rain fell steadily, yet the birds were singing.
d.
do you want to paint your room or would you prefer wallpaper?

How does national geographic allow subjectivity and bias to appear in its video about the flu? a. it uses second-person narration to make the viewer feel guilty for not getting a flu shot. 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 onminous music and a blue filter to make the video more frightening.