Writing formally requires that one follow specific guidelines. Which statement best describes these guidelines?

A) Write in incomplete sentences, don't use slang or filler words, and spell words correctly

B) Don't use slang, punctuate correctly, and use multiple exclamation marks for emphasis

C) Write in complete sentences, don't use slang or filler words, and spell words correctly

D) Don't use filler or slang, punctuate correctly, and spell as well as you can