Read the passage from When Birds Get Flu by John DiConsiglio. Dr. Dowell is a doctor with the Centers for Disease Control and Prevention (CDC) in Atlanta, Georgia. That’s a U. S. government agency that tracks and combats deadly diseases around the world.

How does the supporting text "Disease Control" help the reader to understand the passage?

by explaining how the US government responds to deadly diseases
by explaining what the CDC does in response to deadly diseases
by explaining what Dr. Dowell does in response to deadly diseases
by explaining how the state of Georgia responds to deadly diseases