Respuesta :
I'd say the answer is A.
You're trying to persuade someone for each of them.
Answer:
A) Each document should be written using formal written American English.
Explanation:
This is most likely the characteristic that all of these items would have in common. All of these items are very different in their purpose and their motivation. However, none of them are casual. A letter of complaint, an inquiry about volunteer opportunities, an email about a joint project and a resume all involve a level of formality. Therefore, these texts should be free of slang, casual language or mistakes.