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 13 to 17.

a. Anna: I like studying with friends, We can discuss difficult topics together.
b. Mark: I usually make a study schedule and take notes while reviewing.
c. Anna: What do you think is the best way to prepare for exams?
d. Mark: I prefer studying alone because I can focus better. How about you?
e. Anna: I see. Do you prefer studying alone or with friends?