You've Shared a Document with Several People Who Mirror Your

You've shared a document with several people who mirror your audience's tastes. Three of those people say it's a little tough to read. Which of the following is the BEST strategy to improve its visual impact?

A) Use all capital letters.
B) Put headings in italics rather than bold.
C) Use three fonts instead of one.
D) Use a serif font rather than a sans serif one.
E) None of the above.