Answer: C. a-f-e-d-c-b-g

1. Salutation: Dear Emma,
2. Introduction: I hope you are doing well...
3. Body paragraph 1: First, do you remember our trip to Sapa?...
4. Body paragraph 2: Next, our time in Hoi An was wonderful...
5. Closing: I hope we can meet again soon...
6. Closing phrase: Best wishes,
7. Signature: Tom

Answer: A. a-b-d-e-c-f-g-h

1. Salutation: Dear Students,
2. Introduction: We are excited to invite you...
3. Activity 1: First, we will go on a nature walk...
4. Activity 2: Next, we will have a picnic lunch...
5. Activity 3: Finally, we will play some team games...
6. Conclusion: We hope you will have a great time...
7. Closing: Best wishes,
8. Signature: D-Class Teacher