The written word is often more useful than the spoken.

When writing, particularly in a professional setting, clarity and conciseness are paramount. The guidelines include:

Using short sentences and wordsto make the text easy to read and understand.

Avoiding jargon and abbreviationsto prevent confusion and ensure that the message is accessible to a broader audience.

Using complete sentencesto convey full thoughts.

Sticking to one idea per paragraphto maintain focus and clarity.

Having a clear structurewith a beginning, middle, and end to guide the reader through your argument or narrative.

Being accurateto ensure that the information communicated is reliable.

Option Brefers to a specific format for structuring a document but does not encompass general writing guidelines.

Option Cprovides good tips for the drafting process but lacks comprehensive writing principles.

Option Dlists purposes of writing rather than guidelines.

Thus,Ais the correct answer as it comprehensively covers essential writing guidelines.