Question

Which of the following would be most helpful in creating a more formal and professional tone?

Answer 1

Answer:

E: all of the above

Explanation:

 All the points presented have some advice on how to create a more formal and professional tone in writing communication:

A and B: Mentioning the request in advance , and  better explaining the purpose shows respect and consideration.

C and D: informal language and contractions  are not fit for fomal and professional writing.