For effective document design in business communication,you should

A) fit as much material as possible on each page.
B) mix different typefaces and decorative touches throughout the document.
C) let "simpler" and "fewer" be your guiding concepts.
D) use a one-size-fits-all approach to balance design elements.

The guiding concepts for effective document design in business communication should be "simpler" and "fewer." This means using simple layouts with minimal clutter and avoiding unnecessary elements. This helps to keep the focus on the main message and ensures that the document is easy to read and understand. Fitting as much material as possible on each page (A) can lead to a cluttered and overwhelming design, while mixing different typefaces and decorative touches throughout the document (B) can be distracting and unprofessional. Using a one-size-fits-all approach to balance design elements (D) may not be the best choice, as different types of documents may require different design elements.