Which of the Following Is a Good Practice in Framing

Which of the following is a good practice in framing questions for routine inquiry messages?

A) Combine two or more questions to form a compound question.
B) Avoid the use of bullets or numbering to order questions.
C) Place all of the questions in a single, concise paragraph.
D) Avoid simple yes or no questions unless they are required.
E) Structure questions in such a way that they merely hint at a need for information.