The diagram of the virus mutating help the reader picture a complex process.
Answer: Option D.
Step-by-step explanation:
Flu is the common name for influenza. The virus of influenza most commonly affects the are of nose, throat, and the lungs. The flu spreads very easily when the germs of an ill person who is infected with the flu passes on to the other person when the ill person touches, coughs or sneezes in front of someone else.
The diagram shown of the virus spreading from one person to another helps the readers to understand the process in a very easy way because it is explained in a proper step making it easier to grab.