Mark the letter A, B, C, or D on your answer sheet to indicate the best arrangement of utterances to make a meaningful exchange in the following question.

a. Tom: Yes, actually, I'm attending a course right now. I have been learning for nearly a month and really enjoy the classes.

b. Ann: Oh really? What do you like most about it?

c. Ann: Many thanks! I really appreciate it.

d. Ann: I'm looking for an online course to improve my English skills. Have you taken one before?

e. Tom: Almost everything, especially the native teachers. They are really friendly and helpful. If you are interested, I can send you the link to enroll.