What is the purpose of this public service announcement?

to encourage people to spend time with people who have the flu
to inform people that they can catch the flu from their friends
to inform people that sharing headphones can spread the flu
to encourage people to take precautions against catching the flu

Comparing and contrasting is a form of

What are the authors purposes in writing its our world too young people who are making a difference

Ipronounced his name, offering him at the same time my hand: he took it, smiling and saying, “we shall do very well by-and-by.” then he laid me down, and addressing bessie, charged her to be very careful that i was not disturbed during the night. having given some further directions, and intimates that he should call again the next day, he departed; to my grief: i felt so sheltered and befriended while he sat in the chair near my pillow… (chapter 3) this passage, in which jane first meets the doctor, is an example of