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.

a. Shop assistant: Certainly, but can you let me know about your needs first?
b. Tim: Sure. I'm a student, so I'd like a cheap and light laptop.
c. Tim: Hello. I'm looking for a laptop. Can you please recommend a good one to me?