How could a video best extend the information Dr. Dowell
gives about careers in disease control?
A video could define different types of careers in disease
control.
A video could show Dr. Dowell speaking about careers in
disease control.
A video could explain that there are many careers in
disease control.
A video could show people working in different disease
control careers.

This question is incomplete. Here is the complete question:

Read this excerpt from When Birds Get Flu and Cows Go Mad! How Safe Are We?.

24/7: What kinds of careers are there in disease control?

DR. SCOTT DOWELL: Many types. I'm an epidemiologist. That means I investigate the spread and control of diseases in big populations. Or you could become a virologist. That's a microbiologist who specializes in viruses. If you're interested in animal diseases, you could become a veterinarian.

How could a video best extend the information Dr. Dowell gives about careers in disease control?

A) A video could define different types of careers in disease  control.

B) A video could show Dr. Dowell speaking about careers in  disease control.

C)A video could explain that there are many careers in  disease control.

D)A video could show people working in different disease  control careers.

The correct answer is option D) A video could show people working in different disease  control careers.

Explanation:

A video is a way to extend information on a particular topic. The same can provide extra information by using images.

In this case, Dr. Scott Dowell talks about different types of careers related to diseases, including virologist or veterinarian.

A video could show people working in different disease control careers, such as those mentioned by the doctor.

Given this information we can say that the correct answer is option D.

the president was the speaker and it was a great part of history.

explanation:

video of the national aeronautic space administration's (nasa) coverage of president john f. kennedy’s address at rice university, houston, texas, concerning the nation's efforts in space exploration. in his speech the president discusses the necessity for the united states to become an international leader in space exploration and famously states, "we choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard."

a,b,d are the three sentences that use a reflexive pronoun