To create a meaningful paragraph/letter from the provided sentences, the correct arrangement is:

**D. C-e-a-d-b-f**

This arrangement reads as follows:

1. **Dear Sir/Madam,**
2. I am writing this email to inquire about how to become a member of the Don ca tai tu Club. I saw the advertisement and I am very interested in joining the club.
3. First, I would like to know more about the activities that the club offers. Do you have instrument classes or workshops in addition to singing? I am a beginner and I am interested in learning more about traditional folk singing.
4. Second, I wonder if there are any age or skill level requirements for joining the club. I am not very experienced in singing or playing instruments, but I am very passionate about traditional folk music.
5. Thank you for your time and I look forward to hearing from you.
6. Yours faithfully,
Lan