Answer:
Option B. They address the needs of different academic disciplines
Option C. They include different guidelines.
Step-by-step explanation:
Option A is incorrect because all of the writing style guides have rules for documenting sources, for example, the Harvard style says the name of the article or book must in italic format.
Different Writing Style Guides are used for different disciplines. For example, AP Style is used for stuff associated with Journalism based writings, APA is used for social sciences, MLA Style is used for literature, etc. So every writing style guide deals with a separate academic disciplines. Hence the option B is correct here.
Option C is correct because all of these writing style have different guidelines.
Option D is incorrect because there is a difference between style guides otherwise we don't have bunch of writing styles.