He worked feverishly for a little less than an hour, at the end of which he found he had solved every problem in every branch of higher mathematics that had ever puzzled either him or any of the great mathematicians of the land.

Which context clue is most helpful in determining the meaning of the word feverishly?

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.