Which of the Following Is True About Paragraph Design

Which of the following is true about paragraph design?

A) Paragraphs should usually be at least ten sentences long.
B) Most paragraphs feature a topic sentence.
C) One-line paragraphs fail to emphasize major points in business messages.
D) The most common paragraph arrangement puts the supporting material first, followed by the topic sentence.
E) The opening and closing paragraphs each need at least three sentences.