In Terms of Developing Questions, Your Textbook Identified "Do's" of Question

In terms of developing questions, your textbook identified "Do's" of question wording. Which of the following is NOT a "Do"?

A) The question should be focused on a single issue or topic.
B) The question should be brief.
C) The question should give the respondent an expectation as to the answer.
D) The question should be a grammatically simple sentence.
E) The questions should be crystal clear.