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. Mai: Good idea! I'll also bring a reusable water bottle. Let's get our class to join!
b. Mai: Have you heard about the new green project at school? We can help reduce waste and save energy.
c. Thanh: Yeah! We should recycle more and turn off the lights when we leave.