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.

Dear Nam,
a. All of these efforts aim to not only improve our environment but also raise awareness about the importance of protecting our planet.
b. Additionally, every year we hold a "Clean Up Day" during which students and teachers work together to clean our school and the nearby area.
c. We also have a recycling program where students collect and sort materials like paper, plastic, and glass for recycling.
d. I hope you're doing well. In your last letter, you asked me about the things our school does to keep the surroundings clean and green.
e. At our school, we take part in several green initiatives. For example, we plant trees and maintain a small vegetable garden to encourage sustainability.
Best regards,
Tuan