Mark the letter A, B, C, or D on your answer sheet to indicate the best arrangement of utterances or sentences to make a meaningful exchange or text in each of the following questions from 21 to 25.

a. Peter: Really? Like what?
b. Jane: Hi Peter, I'm writing an essay about the current problems of growing cities.
c. Peter: Hey Jane, what are you doing?
d. Peter: That's true, and they all need somewhere to live too.
e. Jane: Well, there are many different issues to consider. Growing populations can result in there being too many people in one place, which makes life difficult for residents.